Chapter 13 Magnetic Effects of Electric Current – Page 3 – HI MCQ!

Overloading is due to?

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In electric motor, to make the coil rotating continuously in the same direction, current is reversed in the coil after every half rotation by a device called?

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The most important safety method used for protecting home appliances from short circuiting or overloading is?

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Who has stated the Right hand Thumb Rule?

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Which of the following statement is or are correct?

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Commutator rings reverse the direction of current flowing through the coil after every half rotation of the coil.
A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force exerted on the coil which rotates it continuously.
A motor is a device which converts electrical energy to mechanical energy.
All the above.

If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are?

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A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference?

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If the current values periodically from zero to a maximum value, back to zero and then reverses its direction, the current is?

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The nature of magnetic field line passing through the centre of current carrying circular loop is?

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Which of the following factors affect the strength of force experience by a current carrying conduct in a uniform magnetic field?

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