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Q.

Each plate of a parallel plate air capacitor has area  A=5×103m2 and are d=8.85 mm apart as shown in figure. Plate A has positive charge q1=1010 coulomb and plate B has charge q2=2×1010 coulomb. When its positive terminal of battery of emf 10 volts is connected with plate. A and negative terminal with plate B.

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a

The amount of charge on left surface of plate A will decrease when the battery is connected.

b

The amount of charge passes through the battery is  2×1010C.

c

The amount of charge on right surface of plate B will not change when the battery is connected.

d

The amount of charge passes through the battery is  1×1010C.

answer is B, D.

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Detailed Solution

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10=(q0.5×1010)dAε0          q=1010C

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