Consider the following diagram, A solenoid produces a B-friend directed out of t
ID: 1326018 • Letter: C
Question
Consider the following diagram, A solenoid produces a B-friend directed out of the plane of the paper. The current solenoid is increasing at a uniform rate, causing the total flux directed out of the plane of the paper to be increaseing at uniform rate. Two identical flashlight bulbs, 1 and 2, having resistance denoted by R, are connected in a circuit surrounding the solenoid as shown and light up while the flux increase is taking place. Switches, S1 and S2 are initially open.
1. What happens to the brightness of bulb 2 if bulb 1 is removed from its socket while the current in the solenoid is still increasing? explain your reasoning using relevant formulas.
Consider the following diagram, A solenoid produces a B-friend directed out of the plane of the paper. The current solenoid is increasing at a uniform rate, causing the total flux directed out of the plane of the paper to be increaseing at uniform rate. Two identical flashlight bulbs, 1 and 2, having resistance denoted by R, are connected in a circuit surrounding the solenoid as shown and light up while the flux increase is taking place. Switches, S1 and S2 are initially open. 1. What happens to the brightness of bulb 2 if bulb 1 is removed from its socket while the current in the solenoid is still increasing? explain your reasoning using relevant formulas.Explanation / Answer
An air-cored inductor is connected in series with a d.c. supply and a 12 V bulb. The resistance of the solenoid will be low so that it barely affects the light emitted by the bulb, and placing an iron core inside the inductor will make no difference to the bulb's brightness.
If the experiment is repeated using a.c. with an air core, the inductance will probably prevent the lamp from reaching its full brightness. If an iron core is placed inside the solenoid, however, its inductance is increased considerably and the lamp goes out due to the increased self-inductance and resulting back e.m.f. in the coil.