A long current carrying wire produces a magnetic field of 1T at a distance of r. The magnetic field (i) r2 (ii) 2r and (ii) 3r is

Question

Accepted Answer

Correct answer: A. (a) For a long straight wire B= _0i2 πr B ∝ 1r ⇒ B_r2B_r= r r2 ⇒ B_rB_r=2 ⇒B_ r2=2 1=2T Similarly, B_2r= 12T and B_3r= 13T

$A long current carrying wire produces a magnetic field of 1 T at a distance of r . The magnetic field (i) \frac{r}{2} (ii) 2 r and (ii) 3 r is$