Assertion (A): The deflecting torque acting ...

CBSE Class 12 Physics 2023 All Sets Paper

Question : 18 of 18

Marks: +1, -0

Assertion (A): The deflecting torque acting on a current carrying loop is zero when its plane is perpendicular to the direction of magnetic field.

Reason (R): The deflecting torque acting on a loop of magnetic moment

\vec{m}

in a magnetic field

\vec{B}

is given by the dot product of

\vec{m}

and

\vec{B}.

Both Assertion (A) and Reason (R) are true and (R) is the correct explanation of (A).
Both Assertion (A) and Reason (R) are true and (R) is NOT the correct explanation of (A).
Assertion (A) is true and Reason (R) is false.
Assertion (A) is false and Reason (R) is also false.

Solution:

\tau = M B \sin \theta

\tau = 0

\tau = M \times B

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