Physics
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.
Answer
An electromagnet is a temporary strong magnet made by passing current in a coil wound around a piece of soft iron. It is an artificial magnet.
The strength of magnetic field of an electromagnet depends on —
- Number of turns — By increasing the number of turns of windings in the solenoid, the strength of magnetic field of an electromagnet can be increased.
- Current — By increasing the current through the solenoid, the strength of magnetic field can be increased.
Related Questions
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State two advantages of an electromagnet over a permanent magnet.
State two ways by which the strength of an electromagnet can be increased.
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.
