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The poles of ...

Question

The poles of an electromagnet can be changed by reversing the flow of electricity.

A

True

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B

False

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Solution

The correct option is A True

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Q. The polarity of an electromagnet can be changed by changing the direction of electric current through it.

The strength of the magnetic field between the poles of an electromagnet would be unchanged if :

(a) current in the electromagnet winding were doubled

(b) direction of current in electromagnet winding were reversed

(c) distance between the poles of electromagnet were doubled

(d) material of the core of electromagnet were changed

Q. Statement I: The poles of an electromagnet are not affected by changing the direction of the current in the coil.
Statement II: Electromagnets cannot be made more powerful than ordinary bar magnets.

Q. We can change the strength of electromagnets by changing the amount of electricity which is passing through them. Now, answer the following question: The electromagnets are ___________

Q. Liquid oxygen and liquid nitrogen are allowed to flow between the poles of an electromagnet.
Choose the correct observation:

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