Question

2. Two circular coils having identical terms and radii in the ratio 1:3 one joined in the series. Find the ratio of magnetic field at the center of the coil?​

Answer 1

Answer:

l=N

1

2πr

1

=N

2

2πr

2

r

2

r

1

=

N

1

N

2

...(1)

also B

1

=

2r

μ

o

NI

,...(2) current is same for both

using eqation 1 and 2.

B

2

B

1

=

N

2

r

1

N

1

r

2

=

N

1

2

N

2

2

=16/4=4

Answer 2

4:1

hope this helps you :-)

tq