The force exerted on a current carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of the magnetic field is:

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$60 °$

$45 °$

$180 °$

$90 °$

answer is D.

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Detailed Solution

When there is an external magnetic field present, a current-carrying wire experiences a force.
When L is the wire's length, I is current and $θ$ is the angle between the current's direction and the magnetic field, it is discovered that $F = B I L \sin θ$ .
Since the sine of 180 degrees is zero, there is no force applied to a current-carrying wire in a magnetic field when the angle between the wire and the magnetic field's direction is 180 degrees.

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