| Directions: In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: |
| Assertion (A): Capacity of parallel plate condenser remains unaffected on introducing a insulating slab between the plates. |
| Reason (R): Electric field intensity between the plates increases on introducing the insulating slab. |
A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
C) Assertion (A) is true but Reason (R) is false
D) Assertion (A) is false and Reason (R) is also false
Correct Answer: D
Solution :
(d) If the medium between the plates of a capacitor is filled with an insulating substance, the electric field due to the charged plate induces a net dipole moment in the dielectric. This give rise to field in the opposite direction. The net electric field inside the capacitor decreases and hence the potential difference between the plates is reduced. Consequently, the capacitance C increases from its value, when there is no medium.
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