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Q.

Is it true that a steel rod kept inside a current-carrying solenoid is an electromagnet?

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a

True

b

False

answer is B.

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Detailed Solution

The above statement is False.
A solenoid is like a coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder. Generally, a solenoid comprises winding wire over a non-conducting cylindrical tube. When a steel rod is kept inside a current-carrying solenoid, the solenoid doesn't work as an electromagnet because the magnetic strength of the core's steel is very weak.
The correct statement is that a steel rod kept inside a current-carrying solenoid is not an electromagnet. Question Image

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Is it true that a steel rod kept inside a current-carrying solenoid is an electromagnet?