The strength of the electromagnet can be increased by

(a) reversing the directions of current

(b) using an alternating current of high frequency

(c) increasing the current in the coil

(d) decreasing the number of turns of coil.

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Solution

The strength of an electromagnet can be increased by

increasing the number of turns of the coil, and

increasing the current through the coil

Hence, the correct answer is option c.

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Similar questions

Q. What are the possible way(s) by which a strong electromagnet can be made?

1. Decrease the number of turns in the coil.
2. Increase the current in the coil.
3. Use a plastic core inside the coil.
4. Reverse the current direction in the coil.

Q. The strength of magnetic field produced by a current carrying circular coil can be ________ by increasing the number of turns of wire in the coil.

Q. Assertion :If the frequency of alternating current in an ac circuit consisting of an inductance coil is increased then current gets decreased. Reason: The current is inversely proportional to frequency of alternating current.

Q. Yash made his own electromagnet but he found that it is not sufficiently strong. So, what are the possible way(s) that he should use to make the electromagnet strong?
(i) Decrease the number of turns in the coil.
(ii) Increase the current in the coil.
(iii) Use a plastic core inside the coil.
(iv) Reverse the current direction in the coil.

On reversing the direction of current in a wire, the magnetic field produced by it:
(a) gets reversed in direction
(b) increases in strength
(c) decreases in strength
(d) remains unchanged in strength and direction.

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The strength of the electromagnet can be increased by (a) reversing the directions of current (b) using an alternating current of high frequency (c) increasing the current in the coil (d) decreasing the number of turns of coil.

The strength of an electromagnet can be increased by increasing the number of turns of the coil, and increasing the current through the coil Hence, the correct answer is option c.

The strength of the electromagnet can be increased by

(a) reversing the directions of current

(b) using an alternating current of high frequency

(c) increasing the current in the coil

(d) decreasing the number of turns of coil.

The strength of an electromagnet can be increased by

increasing the number of turns of the coil, and

increasing the current through the coil

Hence, the correct answer is option c.