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.

1 and 3 only

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1, 2 and 3

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1, 2 and 4

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2 only

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Solution

The correct option is D 2 only
Strength of an electromagnet can be increased by increasing the current in the coil, increasing the number of turns in the coil and by inserting a soft iron core inside the coil. Reversing the direction of current in the coil will only change the direction of the magnetic field.

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Similar questions

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.

The strength of the electromagnet can be increased by

(a) reversing the directions of current

(b) using an alternating current of high frequency

(d) decreasing the number of turns of 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. In mutual induction
A: when current in one coil increases, induced current in neighbouring coil flows in the opposite direction
B: When current in one coil decreases, induced current in neighbouring coil flows in the opposite direction

The diagram in Fig. shows a coil of several turns of copper wire near a magnet NS. The coil is moved in the direction of arrow shown in the diagram.
(i) In what direction does the induced current flow in the coil ?
(ii) Name the law used to arrive at the conclusion in part (1).
(iii) How would the current in coil be altered if (a) the coil has twice the number of turns, (b) the coil was made to move three times fast ?

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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.

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.