Question

A wire of length land earning current I is shaped into a circular coil of one turn and radius R. How will the magnetic field at the center of this current carrying circular coil change if the same wire is shaped into a coil of n turns now.

Answer 1

Answer:

Magnetic flux, ϕ=50μ Wb

Number of turns, n=200

dt=2×10

−3

Now,

Induced e m f

e=−n

dt

dϕ

e=−200×

2×10

−3

50×10

−6

∣e∣=5

Hence, the average e m f induced in the coil is 5 volt.