Question

A rectangular loop ABCD is placed near on infinite length current carrying wire. Magnetic force on the
loop is :
A
B
25A
15A
10cm
D
5cm
25cm
(source)
(1) 1.25 x 104N, Attraction
(2) 1.25 x 104N, Repulsion
(3) 12.5 x 104 N, Repulsion
(4) 12.5 x 104N Attraction

Answer 1

Answer:

The correct option is D

3.6

×

10

−

2

N

directed towards the wire

F

=

μ

0

i

1

i

2

l

2

π

(

1

r

1

−

1

r

2

)

=

4

π

×

10

−

7

×

40

×

15

×

3

2

π

(

1

0.01

−

1

0.81

)

=

3.6

×

10

−

2

N

This will act towards the long wire