Question Detail

PHY 102 ELECTROSTATICS Objective Question
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Question

When is the electric flux through a surface equal to zero?
Options
A When the electric field is perpendicular to the surface.
B When the electric field is parallel to the surface.
Correct Answer
C When the electric field is very strong.
D When the surface area is very large.
Correct Answer

Option B is the correct answer.

Detailed Explanation

The document states, 'An electric field parallel to the surface contributes no electric flux through the surface.' This occurs when the angle θ between the electric field and the normal to the area is 90°, making cos(90°) = 0, so ψ = EAcosθ = 0 (page 12, referring to Fig. 2.7b).

Hint

Consider the angle between the electric field and the surface normal when the field is parallel to the surface.

Question Info

Course: PHY 102
Topic: ELECTROSTATICS
Type: Objective
Difficulty: Not specified
Question 801 of 1819
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