help in science ! Identity which of the following would have the strongest...

El SeRiO

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...magnetic field.? - 1. identity which of the following would have the strongest magnetic field. Assume the current in each is the same.

A. a straight wire.

B. an electromagnet with 30 coils.

C. a solenoid with 20 coils.

D. a solenoid with 30 coils.

- 2. Why a very strong magnet attracts both poles of a weak magnet. Use the concept of magnetic domains in your explanation.
 
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