Question

Gazala makes the device shown in the diagram and uses it to pick up four paper clips on the point of the nail.



What change would enable Gazala to pick up eight paper clips?

A) reversing the battery
B) reversing the nail and using the nail’s head
C) wrapping the wire around the nail more times
D) unwrapping several loops of the wire from the nail

Answer 1

C) wrapping the wire around the nail more times would enable Gazala to pick up eight more clips

Answer 2

Answer:

The correct answer is C.

Explanation:

To pick up four clips at the tip of the nail, wrap the wire around the nail more times than it already has. This is because the attraction force of the electromagnet is directly proportional to the square of the magnetic field that is generated by passing a current through the coiled wire. The magnetic field, in turn, is proportional to the number of turns that this wire has around the magnetic element, so it is necessary to increase the number of turns so that the strength of the electromagnet is greater.

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