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Question: The strength of the magnetic field at a point distance r near a long straight current carrying wire ...

The strength of the magnetic field at a point distance r near a long straight current carrying wire is B. The field at a distance r/2 will be-

A

B2\frac { B } { 2 }

B

B4\frac { B } { 4 }

C

2B

D

4B

Answer

2B

Explanation

Solution

B = μ0I2πd\frac { \mu _ { 0 } \mathrm { I } } { 2 \pi \mathrm { d } } µ 1 d\frac { 1 } { \mathrm {~d} }