For a straight conductor carrying current

MATHEMATICS · Single correct · ISC · Physics · Magnetic Effects of Current and Magnetism · Ampere's circuital law

Problem

I

, the magnetic fields at points A and B are measured at distances 3 cm and 6 cm from the wire respectively. The ratio

\dfrac{B_{\text{A}}}{B_{\text{B}}}

is (a)

4 : 1

(b)

2 : 1

(c)

1 : 2

(d)

1 : 4