Aconstant current is sent through a helical coil. the coil

a. tends to get shorter explain.

b. tends to get longer

c. tends to rotate about its axis

d. produces zero magnetic field at its center

e. none of the above

A. Tends to get shorter.

Explanation:

When a constant current is sent through a helical coil, then currents are different turns will be equal as well as in the same direction. As currents in same direction attract each other, hence coil tends to get shorter.

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