Assertion :No net force acts on a rectangular coil carrying a steady current when suspended freely in a uniform magnetic field. Reason: Force on coil in magnetic field is always non-zero.

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

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If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

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If Assertion is correct but Reason is incorrect.

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If Assertion is incorrect but Reason is correct.

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Solution

The correct option is C If Assertion is correct but Reason is incorrect.
When a rectangular coil is placed in a uniform magnetic field, the currents in opposite arms is equal in magnitude and opposite in direction.
Hence the force acting on each pair of opposite arms due to uniform magnetic fields cancel each other, and hence no net force acts on the coil. However a torque exists. Assertion is correct.
However the force on a coil is not always non- zero. It depends upon the uniformity of the field.
Hence, reason is incorrect.

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Similar questions

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Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Reason (R) Order is determined experimentally and molecularity is the sum of the stoichimetric coeffcient of rate determining elementary step.

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Choose the correct option.

Q. Assertion: Average kinetic energy in one oscillation during

SHM

of a body is

\frac{1}{4} m ω^{2} A^{2}

.
Reason: Maximum kinetic energy is

\frac{1}{2} m ω^{2} A^{2}

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