In the circuit represented by the figure below the bulb B has a higher resistanc

Question

In the circuit represented by the figure below the bulb B has a higher resistance than the two outside bulbs. The object shown below which has two blocks of plastic (the one on the left with a large negative charge and the one on the right with an equally large positive charge) connected by a block of wood is going to be placed instantaneously in the gap at the top of the circuit above. This object will not touch the wire on either side of the gap. Would the charges in the segment of the wire to the right of the gap experience any electric force when the block is in place? If yes, what would the direction of that force be? If no, why not? Would you expect any charges in the electric circuit to move? If yes, how? If no, why not? If you think charges in the circuit will move which ones will move and where?

Explanation / Answer

(a) Yes, because when the block is placed in the gap due to induction (as the block is not touching the wire) the free electrons in the wire will experience a force towards the block, that is, towards left.

(b) Yes, because when the block is placed in the gap then due to induction the free electrons of the wire in the right segment experience an attractive force and move towards left and in the left segment the free electrons experience a repulsive force and move away from the block, that is, towards left.

(c) The free electrons will move and towards left.

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