Physics
The diagram in figure. shows a coil wound around a soft iron bar XY. (a) State the polarity at the end X and Y as the switch is pressed. (b) Suggest one way of increasing the strength of electromagnet so formed.
Answer
(a) When current is passed through the winding of the solenoid, current at end X is in anticlockwise direction so it becomes the North pole. The current at end Y is in clockwise direction so it becomes the South pole.
(b) One way of increasing the strength of electromagnet so formed is by reducing resistance of circuit by means of rheostat to increase current in the coil.
Related Questions
Why does a current carrying freely suspended solenoid rest along a particular direction? State the direction in which it rests.
State two ways by which the strength of an electromagnet can be increased.
What effect will there be on a magnetic compass when it is brought near a current carrying solenoid?
What is an electromagnet? Name two factors on which the strength of magnetic field of an electromagnet depends and state how does it depend on the factors stated by you.