1
KCET 2021
+1
-0

If a slab of insulating material (conceptual). $$4 \times 10^{-3} \mathrm{~m}$$ thick is introduced between the plates of a parallel plate capacitor, the separation between the plates has to be increased by $$3.5 \times 10^{-3} \mathrm{~m}$$ to restore the capacity to original value. The dielectric constant of the material will be

A
6
B
8
C
10
D
12
2
KCET 2021
+1
-0

Eight drops of mercury of equal radii combine to form a big drop. The capacitance of a bigger drop as compared to each smaller drop is

A
2 times
B
8 times
C
4 times
D
16 times
3
KCET 2021
+1
-0

An electrician requires a capacitance of $$6 \mu \mathrm{F}$$ in a circuit across a potential difference of $$1.5 \mathrm{~kV}$$. A large number of $$2 \mu \mathrm{F}$$ capacitors which can withstand a potential difference of not more than $$500 \mathrm{~V}$$ are available. The minimum number of capacitors required for the purpose is

A
3
B
9
C
6
D
27
4
KCET 2021
+1
-0

In figure, charge on the capacitor is plotted against potential difference across the capacitor. The capacitance and energy stored in the capacitor are respectively.

A
$$12 \mu \mathrm{F}, 1200 \mu \mathrm{J}$$
B
$$12 \mu \mathrm{F}, 600 \mu \mathrm{J}$$
C
$$24 \mu \mathrm{F}, 600 \mu \mathrm{J}$$
D
$$24 \mu \mathrm{F}, 1200 \mu \mathrm{J}$$
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