Question

what happens to the magnetic strength received by both nails if the switches in figures A softiron nail,,, B steel nail,, are turned off? why?​

Answer 1

Answer:

When switches in figure A and B are turned on, there is movement of current through the circuit and the coil around the respective soft iron and steel core. This resembles a solenoid (or an electromagnet). There will be development of magnetic field once switch is closed.

2. Now, magnetic field intensity (synonymous to strength) is directly proportional to the permeability of the core of the electromagnet.

Soft iron has higher permeability than steel.

So, the strength of figure A magnet will be higher.

3. Once , switches are turned off, current no more flows through the circuit. As a result, the magnetic field intensity goes on decreasing until it becomes zero.

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