| 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): When air between the plates of a parallel plate condenser is replaced by an insulating medium of dielectric constant its capacity increases. |
| Reason (R): Electric field intensity between the plates with dielectric in between it is reduced. |
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: A
Solution :
(a) The capacity of a parallel plate condenser is given by, \[C=\frac{q}{V}\] (1) Electric field intensity becomes \[\frac{1}{K}\]times \[\left[ as\,K={{E}_{0}}/E \right]\]therefore potential V also becomes 1/K times. Hence, from eq. (1) capacity becomes K times. Thus electric field decreases and capacitance increases when condenser is filled with insulated medium of some dielectric constant.
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