| ASSERTION: When air between the plates of a parallel plate condenser is replaced by an insulating medium of dielectric constant its capacity increases. |
| REASON: Electric field intensity between the plates with dielectric in between it is reduced. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
The capacity of a parallel plate condenser is given by, \[C=\frac{q}{V}\] Electric field intensity becomes \[\frac{1}{K}\] times [as \[K={{E}_{0}}/E\]], therefore potential V also becomes \[\frac{1}{K}\]times. Hence, from equation (i) 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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