Question

A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the e.m.f. induced in the wire is 2 V, the magnitude of the field in tesla is ______.

Options

• 2

• 5

• 0.8

• 2.5

Answer 1

A wire of length 50 cm moves with a velocity of 300 m/min, perpendicular to a magnetic field. If the e.m.f. induced in the wire is 2 V, the magnitude of the field in tesla is 0.8.

Explanation:

The magnitude of induced e.m.f. is given by

|e| = Blv

v = 300 m/min = 5m/s

∴ B = `|"e"|/"lv"`

= `2/(0.5xx5)`

= 0.8 tesla