Consider a thin wire bent into the shape of a ring of radius of 10 cm that carries a steady 2.0-A current. The value of the magnetic field at the center of the ring is
A) $45 \mu$ T.
B) $13 \mu$ T.
C) $25 \mu$ T.
D) $6.3 \mu$ T.

Question

Quizplus · Accepted Answer

The magnetic field at the center of a current-carrying loop is given by $ B = \frac{\mu_0 I}{2R} $. Substituting $ \mu_0 = 4\pi \times 10^{-7} \, \text{T}\cdot\text{m/A} $, $ I = 2.0 \, \text{A} $, and $ R = 0.1 \, \text{m} $, we get $ B = 13 \mu \text{T} $.

Consider a Thin Wire Bent into the Shape of a Ring