Question

5. A metallic wire having length of 2 m and weight of
4 x 10" N is found to remain at rest in a uniform
and transverse magnetic field of 2 x 104 T. Current
flowing through the wire is :
(a) 10 A (b) 5 A (c) 2 A (d) 1 A
​

Answer 1

Answer:

(d) 10A

Explanation:

Since the wire is at rest it means that the net force acting of the wire is zero. Hence,

Weight=MagneticForce,

F=IlB

⟹I= F/lB

⟹I= 4×10^-3/2×2×10^-4

⟹I=10A