Problem: Magnetic field lines form closed loops:A. Through current-carrying loops.B. Around current-carrying straight wires.C. Around and through bar magnets.D. All of the above.

FREE Expert Solution

Magnetic field lines exist as closed loops. 

In bar magnets, the loops leave a magnet from the north pole and enter the magnet in the south pole, then travel within the magnet from south to north.

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Problem Details

Magnetic field lines form closed loops:

A. Through current-carrying loops.

B. Around current-carrying straight wires.

C. Around and through bar magnets.

D. All of the above.