Question

Two straight wires 1 and 3, each of length L=4 cm, are connected by a quarter circular arc wire 2 of radius R=3 cm, as shown in Fig A. Determine the magnitude and direction of the magnetic field at the center P of the arc, when the current I is 2A.​

Answer 1

Explanation:

Magnetic field at O due to two straight wires =0

Magnetic field due to circular wire:

B=

4

1

(due to whole circle)

=

4

1

(

2R

μ

o

i

) (inwards)

=

4

1

×

2×0.03

(4π×10

−7

)(5)

=2.62×10

−5

T