Question

Two circular coils are made of two identical wires of same length. If the number of turns of two coils is 4 and 2, then the ratio of magnetic induction at centres coil will be​

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

Answer:

HOPE IT HELPS. !!!!!.

Explanation:

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