Q.

A rod PQ is connected to the capacitor plates. The rod is placed in a magnetic field (B) directed downward perpendicular to the plane of the paper. If the rod is pulled out of magnetic field with velocity v→ as shown in figure,

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a

Plate M will be positively charged

b

Plate N will be positively charged

c

Both plates will be similarly charged.

d

No charge will be collected on plates

answer is A.

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Detailed Solution

Consider the force on an electron in PQ. This electron experiences a force towards Q. Free electrons in PQ tend to move towards N. So M will be positively charged.
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A rod PQ is connected to the capacitor plates. The rod is placed in a magnetic field (B) directed downward perpendicular to the plane of the paper. If the rod is pulled out of magnetic field with velocity v→ as shown in figure,