Question

at what distance from a long straight wire carrying current of 12 A will the magnetic field be equal to 3×10(-5)Wb m-2
hlw​

Answer 1

Answer:

B=3×10

−5

Wb/m

2

i=12A

The magnetic field at a distance r from the long current carrying straight wire is given by,

B=

2πr

μ

0

i

r=

2πB

μ

0

i

r=

2π×3×10

−5

4π×10

−7

×12

r=8×10

−2

m