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PhysicsNEET 2024Capacitors: series, parallel, energy stored

Electrostatic Potential and Capacitance

If the plates of a parallel plate capacitor connected to a battery are moved closer to each other, then:

A. the charge stored in it increases.

B. the energy stored in it decreases.

C. its capacitance increases.

D. the ratio of charge to its potential remains the same.

E. the product of charge and voltage increases.

Choose the most appropriate answer from the options given below:

  1. A.A, C and E only✓
  2. B.B, D and E only
  3. C.A, B and C only
  4. D.A, B and E only

Solution

At constant VV (battery connected), C=ε0AdC = \frac{\varepsilon_0 A}{d} rises as dd falls, so Q=CVQ = CV rises and U=12CV2U = \frac12 CV^2 rises; Q/V=CQ/V = C increases; QVQV increases. A, C and E are correct; B and D are false.

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