Question

A student made the electromagnet shown and used it to pick up one sewing pin. Which change to the electromagnet would most likely allow it to pick up two sewing pins? (A P E X)

A. Double the length of the wires that connect it to the battery.

B. Replace the nail with a thick roll if paper.

C. Double the number of coils of wires around the nail.

D. Replace the nail with a large bolt.​

Answer 1

C - the more coils, the more current is flowing around the nail, which means the Magnet field is stronger.

Don’t know how advanced this class is but this is all found in Maxwell’s Equations (that combine electricity and magnetism)

Answer 2

Answer:

C. Double the number of coils of wires around the nail.

Explanation:

What is the role of number of terns in electromagnetism?

The magnetic field intensity produced by coil ( Solenoid ) is directly proportional to the number of terns and electric current .So the magnetic field produced by it is,

$B = 4\pi * 10^{-7} * N*i$

Here N is number of terns in the solenoid and i is current.

Hence by doing double of number of coil of wires, the magnetic field will be doubled.

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