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Q.

A parallel plate condenser with air between the plates possesses the capacity of 10-12 F. Now, the plates are removed apart, so that the separation is twice the original value. The space between the
plates is filled with a material of dielectric constant 4.0. Then new value of the capacity is (in farad)

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a

3×10-12

b

0.5×10-12

c

4×10-12

d

2×10-12

answer is C.

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Detailed Solution

Capacitance, C'=0Ad    or     C'Kd'

                 C'C=Kdd'

Here, K=4.0,   d'=2d

                 C'=10-124.02

                          =2×10-12 F

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