Question

An infinitely-long conductor has a current of 14A flowing as shown in the figure. Find the magnetic field at center C.

• A. $88\mu T$
• B. $44\mu T$
• C. $10\mu T$
• D. $120\mu T$

Answer 1

Answer: (B)

$44\mu T$

Answer 2

The correct option is (B): $44\mu T$

$B=\frac{\mu_0i}{4R}$

$=\frac{4\pi\times10^{-7}\times14}{4\times0.1}$T

$=\frac{22}{7}\times10^{-7}\times\times140$ T

$=44\mu$T