Magnetism I | Magnetic Field Due To An Infinitely Long Straight Thin Wire

The magnitude of the magnetic field of a long straight wire carrying a current of 1 A at a distance of 2 cm is-

(A) 10^-5 T

(B) 10^-7 T

(C) 2 x 10^-7 T

(D) 2 x 10^-5 T

A long straight wire in the horizontal plane carries a current of 75 A in north to south direction. The magnitude and direction of the magnetic field at a point 3 m east of the wire is-

(A) 4 x 10^-6 T, vertically up

(B) 5 x 10^-6 T, vertically down

(C) 5 x 10^-6 T, vertically up

(D) 4 x 10^-6 T, vertically down