Problem: Magnetic field lines form closed loopsa) Around and through bar magnets.b) Through current-carrying loops.c) Around current-carrying straight wires.d) All of the above.

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Magnetic field lines form closed loops:

Around and through bar magnets. Magnetic field lines start from the North pole and terminate at South poles, hence they form a closed loop around and through bar magnets.

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Problem Details

Magnetic field lines form closed loops

a) Around and through bar magnets.

b) Through current-carrying loops.

c) Around current-carrying straight wires.

d) All of the above.