Physics
The strength of an electromagnet can be increased:
- by increasing the number of turns in the coil.
- by decreasing the number of turns in the coil.
- by inserting a soft iron core in the coil.
- both increasing the number of turns in the coil and inserting a soft iron core.
Electro-Magnetism
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Answer
both increasing the number of turns in the coil and inserting a soft iron core.
Reason — The strength of an electromagnet can be increased by the following three ways :
- By inserting a rod of soft iron or steel inside the cylindrical tube.
- By increasing the total number of turns in the coil.
- By increasing the strength of current passing through the coil.
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