CBSE Class 12 Physics 2023 Delhi Set 1 Paper

Question : 18

Total: 35

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

→

in a magnetic field

→

is given by the dot product of

→

and

→

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: 👈: Video Solution

τ=NBIAsin‌θ
θ is the angle between the area vector and the direction of magnetic field.
If the plane of loop is perpendicular to the electric field, then the angle between the area vector and the direction electric field is 00. Hence, τ=0.
So, the assertion is true.
The torque is the cross product of the magnetic moment of the loop and the magnetic field. Hence the reason is false.

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