Objective Questions

Questions (1819)

#	Question	Topic	Actions
101	In a DC generator, the output voltage is not constant but:	Electromagnetic Induction	View
102	Why do commercial motors use many coils of wire around the armature?	Electromagnetic Induction	View
103	A magnetic field of 0.2 T passes through a loop of area 0.05 m² at an angle of …	Electromagnetic Induction	View
104	A wire of length 0.4 m moves at 6 m/s at 90° to a 0.3-T field. What is the indu…	Electromagnetic Induction	View
105	What is the induced emf in a 0.5-m wire moving at 10 m/s at 30° to a 0.4-T fiel…	Electromagnetic Induction	View
106	A 100-turn coil with area 0.01 m² rotates in a 0.2-T field at 50 rad/s. What is…	Electromagnetic Induction	View
107	If a coil of 200 turns has a flux change of 0.02 Wb in 0.05 s, what is the indu…	Electromagnetic Induction	View
108	What is a Gaussian surface?	Gauss's Law and Electrostatic Fields	View
109	What is the electric field inside a hollow charged conducting sphere?	Gauss's Law and Electrostatic Fields	View
110	For a hollow charged sphere, what is the electric field outside the sphere?	Gauss's Law and Electrostatic Fields	View
111	Which of the following statements is true about a hollow conducting sphere in e…	Gauss's Law and Electrostatic Fields	View
112	What is the electric field at the center of a uniformly charged solid non-condu…	Gauss's Law and Electrostatic Fields	View
113	What is the electric field just outside a charged conducting sphere (radius a, …	Gauss's Law and Electrostatic Fields	View
114	What is the electric field inside a charged conducting sphere (solid or hollow)?	Gauss's Law and Electrostatic Fields	View
115	For a charged conducting plane of infinite extent with surface charge density σ…	Gauss's Law and Electrostatic Fields	View
116	For a charged non-conducting sheet (insulating sheet) with uniform surface char…	Gauss's Law and Electrostatic Fields	View
117	What is the electric field inside a parallel plate capacitor (between the plate…	Gauss's Law and Electrostatic Fields	View
118	What is the capacitance of a parallel plate capacitor with plate area A and sep…	Gauss's Law and Electrostatic Fields	View
119	If the plate area of a parallel plate capacitor is doubled, what happens to the…	Gauss's Law and Electrostatic Fields	View
120	If the plate separation of a parallel plate capacitor is doubled, what happens …	Gauss's Law and Electrostatic Fields	View
121	What is the relationship between electric field E and electric potential V in o…	Gauss's Law and Electrostatic Fields	View
122	For a uniform electric field E between parallel plates separated by distance d,…	Gauss's Law and Electrostatic Fields	View
123	A charged particle of mass m and charge q enters a uniform electric field E per…	Gauss's Law and Electrostatic Fields	View
124	A positive charge of 5 μC, mass 2×10⁻⁹ kg, is placed in a uniform electric fiel…	Gauss's Law and Electrostatic Fields	View
125	A charge is launched horizontally into a uniform vertical electric field. The p…	Gauss's Law and Electrostatic Fields	View
126	What is the electric field in the region between two large parallel conducting …	Gauss's Law and Electrostatic Fields	View
127	What is the work done in moving a charge q from point A to point B in an electr…	Gauss's Law and Electrostatic Fields	View
128	What is an equipotential surface?	Gauss's Law and Electrostatic Fields	View
129	What is the direction of the electric field relative to an equipotential surfac…	Gauss's Law and Electrostatic Fields	View
130	For a point charge, what is the shape of the equipotential surfaces?	Gauss's Law and Electrostatic Fields	View
131	What is the electric flux through a closed surface that encloses no net charge?	Gauss's Law and Electrostatic Fields	View
132	What is the SI unit of electric flux?	Gauss's Law and Electrostatic Fields	View
133	What is the electric field at a distance r from an infinitely long line charge …	Gauss's Law and Electrostatic Fields	View
134	What is the electric field due to an infinite plane of charge with surface char…	Gauss's Law and Electrostatic Fields	View
135	For a uniformly charged solid sphere of radius R and total charge Q, what is th…	Gauss's Law and Electrostatic Fields	View
136	For a uniformly charged solid sphere of radius R and total charge Q, what is th…	Gauss's Law and Electrostatic Fields	View
137	What is the electric field just outside a charged conductor?	Gauss's Law and Electrostatic Fields	View
138	What is the electric field inside a conducting material in electrostatic equili…	Gauss's Law and Electrostatic Fields	View
139	If a positive charge is placed at the center of a hollow conducting sphere, wha…	Gauss's Law and Electrostatic Fields	View
140	What is the potential inside a hollow charged conducting sphere?	Gauss's Law and Electrostatic Fields	View
141	What is a capacitor?	Capacitors and Capacitance	View
142	What is the SI unit of capacitance?	Capacitors and Capacitance	View
143	Which of the following factors does NOT affect the capacitance of a parallel pl…	Capacitors and Capacitance	View
144	What is the formula for the capacitance of a parallel plate capacitor with plat…	Capacitors and Capacitance	View
145	What is the permittivity of free space (ε₀)?	Capacitors and Capacitance	View
146	A parallel plate capacitor has plates of area 0.05 m² separated by 0.001 m with…	Capacitors and Capacitance	View
147	If the area of the plates of a parallel plate capacitor is doubled, what happen…	Capacitors and Capacitance	View
148	If the distance between the plates of a parallel plate capacitor is doubled, wh…	Capacitors and Capacitance	View
149	What is the dielectric constant (K) of a material?	Capacitors and Capacitance	View
150	A parallel plate capacitor with air has capacitance 10 pF. When filled with a d…	Capacitors and Capacitance	View
151	What is the formula for the capacitance of a cylindrical capacitor?	Capacitors and Capacitance	View
152	Three capacitors C₁, C₂, C₃ are connected in series. What is the equivalent cap…	Capacitors and Capacitance	View
153	Three capacitors C₁, C₂, C₃ are connected in parallel. What is the equivalent c…	Capacitors and Capacitance	View
154	A 1 μF and a 2 μF capacitor are connected in series. What is their equivalent c…	Capacitors and Capacitance	View
155	A 1 μF and a 2 μF capacitor are connected in parallel. What is their equivalent…	Capacitors and Capacitance	View
156	For capacitors in series, which statement is true?	Capacitors and Capacitance	View
157	For capacitors in parallel, which statement is true?	Capacitors and Capacitance	View
158	What is the energy stored in a capacitor?	Capacitors and Capacitance	View
159	What is the time constant τ of an RC circuit?	Capacitors and Capacitance	View
160	In an RC charging circuit, after one time constant (t = RC), the capacitor volt…	Capacitors and Capacitance	View
161	In an RC discharging circuit, after one time constant (t = RC), the capacitor v…	Capacitors and Capacitance	View
162	What are the units of the time constant RC?	Capacitors and Capacitance	View
163	A capacitor of 100 μF is charged through a 10 kΩ resistor. What is the time con…	Capacitors and Capacitance	View
164	What is the energy density (energy per unit volume) stored in the electric fiel…	Capacitors and Capacitance	View
165	In a series RC circuit with a battery, what happens to the current as the capac…	Capacitors and Capacitance	View
166	What is the voltage across a capacitor immediately after the switch is closed i…	Capacitors and Capacitance	View
167	What is the voltage across a capacitor after a long time (in steady state) in a…	Capacitors and Capacitance	View
168	What is the work required to carry an electron (q = -1.6×10⁻¹⁹ C) from the posi…	Capacitors and Capacitance	View
169	An electron starts from rest and falls through a potential rise of 80 V. What i…	Capacitors and Capacitance	View
170	If the dielectric constant of a material is 5, how does the capacitance compare…	Capacitors and Capacitance	View
171	What is the induced charge density on the surface of a dielectric inserted betw…	Capacitors and Capacitance	View
172	According to the principles of electrostatics, what happens when two charged pl…	Electrostatics: Electric Charge and Coulomb's Law	View
173	What is the fundamental rule regarding the conservation of electric charge in a…	Electrostatics: Electric Charge and Coulomb's Law	View
174	Which of the following best describes the distribution of charge within a neutr…	Electrostatics: Electric Charge and Coulomb's Law	View
175	A water molecule is described as a 'polar molecule.' What does this mean in ter…	Electrostatics: Electric Charge and Coulomb's Law	View
176	Which category of materials allows electric charge to flow freely through them?	Electrostatics: Electric Charge and Coulomb's Law	View
177	If a neutral metal rod is charged by 'conduction,' what must occur?	Electrostatics: Electric Charge and Coulomb's Law	View
178	What is the result of 'charge separation' in a neutral metal rod when a positiv…	Electrostatics: Electric Charge and Coulomb's Law	View
179	What is the primary function of an electroscope in a laboratory setting?	Electrostatics: Electric Charge and Coulomb's Law	View
180	According to Coulomb's Law, the electric force between two point charges is inv…	Electrostatics: Electric Charge and Coulomb's Law	View
181	What is the value of the proportionality constant 'k' in Coulomb's Law?	Electrostatics: Electric Charge and Coulomb's Law	View
182	If a charge is measured as 1 μC (microcoulomb), how many coulombs is it equal t…	Electrostatics: Electric Charge and Coulomb's Law	View
183	The charge on a single electron is approximately 1.602 x 10^-19 C. What does th…	Electrostatics: Electric Charge and Coulomb's Law	View
184	In the vector form of Coulomb's Law, the force is directed along what path?	Electrostatics: Electric Charge and Coulomb's Law	View
185	Two charges, Q1 = 50 μC and Q2 = 1 μC, are separated by a distance. How does th…	Electrostatics: Electric Charge and Coulomb's Law	View
186	How is the electric field (E) defined at a specific point in space?	Electrostatics: Electric Charge and Coulomb's Law	View
187	Which of the following describes the electric field generated by a single posit…	Electrostatics: Electric Charge and Coulomb's Law	View
188	In a photocopy machine, how is the dry toner (ink) attracted to the drum?	Electrostatics: Electric Charge and Coulomb's Law	View
189	If the electric field at a point is 3.0 x 10^5 N/C directed to the right, what …	Electrostatics: Electric Charge and Coulomb's Law	View
190	What happens to the electric field strength at a point if the distance from a p…	Electrostatics: Electric Charge and Coulomb's Law	View
191	How should a continuous distribution of charge be treated when calculating the …	Electrostatics: Electric Charge and Coulomb's Law	View
192	What is the electric field formula for an infinite plane of charge with surface…	Electrostatics: Electric Charge and Coulomb's Law	View
193	Between two closely spaced, oppositely charged parallel plates, the electric fi…	Electrostatics: Electric Charge and Coulomb's Law	View
194	A proton and an electron are released from rest 1 meter apart. Where would they…	Electrostatics: Electric Charge and Coulomb's Law	View
195	The number of electric field lines starting or ending on a charge is proportion…	Electrostatics: Electric Charge and Coulomb's Law	View
196	What is an electric dipole?	Electrostatics: Electric Charge and Coulomb's Law	View
197	What is the static electric field inside a good conductor in equilibrium?	Electrostatics: Electric Charge and Coulomb's Law	View
198	Where does the net charge on a conductor reside when it is in electrostatic equ…	Electrostatics: Electric Charge and Coulomb's Law	View
199	The electric field at the surface of a conductor must be directed in what way?	Electrostatics: Electric Charge and Coulomb's Law	View
200	A neutral hollow metal box can protect its interior from external electric fiel…	Electrostatics: Electric Charge and Coulomb's Law	View

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Questions (1819)