Chapter 13 Magnetic Effects of Electric Current – HI MCQ!

A magnetic field line is used to find the direction of?

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choose the statement which is/ are incorrect?

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The core of an electromagnet must be soft iron because soft iron losses all of its magnetism when current in the coil is switched off.
If steel is used for making the core of an electromagnet, the steel does not lost all its magnetism when the current is stopped and it becomes a permanent magnet.
An electromagnet is a magnet consisting of a long coil of insulated copper wire wrapped around a soft iron core that is magnetized only when electric current is passed through the coil.
None of the above.

On increasing number of turns magnetic field of a solenoid?

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In India the potential difference between live wire and neutral wire is?

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The most suitable material for making the core of an electromagnet is?

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At the time of short circuit the current in the circuit.?

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A 3-Pin mains plug is fitted to the cable for a 1 kw electric kettle to be used on a 250 v a.c. supply. which of the following statements is not correct?

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A plotting compass is placed near the south pole of a bar magnet. the pointer of plotting compass will?

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Which of the following statement is or are correct?

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Magnetic lines of force inside current carrying solenoid are?

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