A circular loop of wire 1.0 cm in radius carries a current of 30 A.The magnetic field at the center of the loop is
A)1.9 mT
B)2.4 mT
C)3.8 mT
D)12 $\mu$T
E)48 $\mu$T

Question

Quizplus · Accepted Answer

The magnetic field at the center of the loop can be calculated using the formula B = μ0I/2r, where μ0 is the permeability of free space, I is the current, and r is the radius of the loop. Plugging in the given values, we get B = (4π×10^-7 T∙m/A) × (30 A) / (2×0.01 m) = 3.8 mT. Therefore, the best choice is C.

A Circular Loop of Wire 1 μ\muμ T E)48 μ\muμ T

A Circular Loop of Wire 1 $\mu$ T
E)48 $\mu$ T