Question

Ques. 17 (SMCQ)
Marks: +3,-1
Two concentric coils each of radius equal
to 27 cm are placed at right angle to each
other. 3 A and 4 A are the currents
flowing in each coil respectively. The
magnetic induction (in Wb m-2) at the
centre of the coils
will
Ho = 41 x 10-7 Wb A-' m )
be​

Answer 1

Explanation:

The magnetic field due to circular coil,

B

1

=

2r

μ

0

i

=

2(2π×10

−2

)

μ

0

i

1

=

4π

μ

0

×3×10

2

B

2

=

2(2π×10

−2

)

μ

0

i

2

=

4π

μ

0

×4×10

2

B=

B

1

2

+B

2

2

=

4π

μ

0

.5×10

2

⇒B=10

−7

×5×10

2

⇒B=5×10

−5

Wb/m

2