Question

: A straight wire having mass of 1.2 kg and length of
1 m carries a current of 5 A. If the wire is suspended
in mid-air by a uniform horizontal magnetic field, then
the magnitude of field is​

Answer 1

Answer:

Mass of wire (m) = 200 grams or 0.2 kg

length (L) = 1.5 m

Current (I) = 2 A

Acceleration due to gravity (g) = 9.8 m/s^2

The weight of the wire will be balanced by the magnetic force acting in the opposite direction.

Let the magnetic field be B.

mg = ILB

B = 0.653 T