Q19 of 238 Page 82

Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors?

It depends on following factors:-

i) Current: Larger he current, stronger will be the magnetic field.

ii) Number of coils in the solenoid: Greater the number of coils in the solenoid, stronger will be the magnetic field produced.

What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?

State and explain the Clock face rule for determining the polarities of a circular wire carrying current.

Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.

Describe how an electromagnet could be used to separate copper from iron in a scrap yard.