Question Detail
Question
A 200V battery charges a capacitor C. It is discharged through a coil in a block (specific heat 2.5×10² J kg⁻¹ K⁻¹, mass 0.1kg). Temperature rises by 0.4K. What is C?
Correct Answer
Option D is the correct answer.
Detailed Explanation
Energy stored = mcΔT = 0.1 × 250 × 0.4 = 10J. E = ½CV² => C = 2E/V² = 20/40000 = 5.0×10^-4 F.
Hint
Energy stored in capacitor = ½CV².