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Q.

What is the force on a current-carrying wire that is parallel to a magnetic field?

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a

Zero

b

Twice

c

Three times

d

None of these

answer is A.

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Detailed Solution

The force on a current-carrying wire parallel to the magnetic field is zero.
A current carrying wire parallel to the magnetic field will experience no force. This is because the magnitude of force depends on the sine of the angle formed by the current direction and the magnetic field direction. As a result, if the current carrying wire is parallel to the magnetic field, the force is zero.

F_{H} = \frac{idl \times \underset{̲}{B}}{r^{2}}

Since

\underset{̲}{B}

and

\underset{̲}{r}

are parallel, so,

F_{H} = 0

.

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