You have three light bulbs; bulb A has a resistance of 240 ohm, bulb B has a res

Question

You have three light bulbs; bulb A has a resistance of 240 ohm, bulb B has a resistance of 192 ohm, and bulb C has a resistance of 144 ohm. Each of these bulbs is used for the same amount of time in a setup like the one in the drawing. In each case the speed of the rod and the magnetic field strength are the same. Rank the setups in descending order, according to how much work the hand in the drawing must do (largest amount of work first).

(a) A, B, C

(b) A, C, B

(c) B, C, A

(d) B, A, C

(e) C, B, A

Explanation / Answer

From the Ohm's law (V/R= I) resistance is inverslly proportional to current so. low resistance bulb(C) will cause high current to flow through it. The force acting acting on a current carrying conductor is diretlcy proportioanl to current ( F= BIL) hence the bulb with low resistance shows greater force.

The formula for work done is

W= Fd

so greater force has greater work

so rak from greatest work to smallest work is

CB A

option (e) is correct answer

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