1
CBSE 12th Physics Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+1
-0

Two long parallel wires kept $$2 \mathrm{~m}$$ apart carry $$3 \mathrm{~A}$$ current each, in the same direction. The force per unit length on one wire due to the other is

A
$$4.5 \times 10^{-7} \mathrm{~Nm}^{-1}$$, attractive
B
$$4.5 \times 10^{-7} \mathrm{~N} / \mathrm{m}$$, repulsive
C
$$9 \times 10^{-7} \mathrm{~N} / \mathrm{m}$$, repulsive
D
$$9 \times 10^{-7} \mathrm{~N} / \mathrm{m}$$, attractive
2
CBSE 12th Physics Delhi Set 1 - 2023
MCQ (Single Correct Answer)
+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 $$\vec{B}$$.

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