To check whether a lightbulb permanently attached to a coil is still good, you p

Question

To check whether a lightbulb permanently attached to a coil is still good, you place the coil next to another coil that is attached to a battery, as shown in the figure. (Figure 1) Assume the lightbulb is ok.

Part A

What happens to the bulb when the switch in loop A is closed?

What happens to the bulb when the switch in loop A is closed?

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Part B

What happens to the bulb if the switch in circuit A is kept closed?

What happens to the bulb if the switch in circuit A is kept closed?

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Part C

What happens to the bulb when the switch in loop A is opened?

What happens to the bulb when the switch in loop A is opened?

the bulb lights up the bulb goes off (not burned out) the bulb lights up briefly the bulb burnes out

Explanation / Answer

Here ,

when the loop is closed

there a new start current flowing in the circuit

which produce a changing magnetic flux in the bulb loop B for some time. then the flux is contant.

hence , the bulb lights up briefly.

part B)

When the switch is kept closed

the current in the cirucit A will be constant ,

rate of change of magnetic flux in B will be zero

and no current flow in B

the bulb goes off (not burned out)

part c)

as when the loop is opened

the magnetic flux in loop B due to magnetic field produced by A changes

the bulb lights up briefly

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