Students built two electromagnets. The electromagnets are the same except that one has 20 wire coils around its core, and the other has 40 wire coils around its core. Which is the best comparison?(1 point)

Question

Responses

The electromagnets will be equally strong.
The electromagnets will be equally strong.

The electromagnet with 40 coils will be stronger than the electromagnet with 20 coils.
The electromagnet with 40 coils will be stronger than the electromagnet with 20 coils.

The electromagnet with 40 coils will be exactly twice as strong as the electromagnet with 20 coils.
The electromagnet with 40 coils will be exactly twice as strong as the electromagnet with 20 coils.

The electromagnet with 20 coils will be stronger than the electromagnet with 40 coils.

Answer 1

The correct comparison is:

The electromagnet with 40 coils will be stronger than the electromagnet with 20 coils.

In general, the strength of an electromagnet increases with the number of wire coils around its core, as more coils result in a greater magnetic field. However, it is not accurate to say that the electromagnet with 40 coils will be exactly twice as strong as the one with 20 coils, as the strength of an electromagnet also depends on factors such as current and the material of the core. Thus, the best choice is that the electromagnet with 40 coils will simply be stronger.