Question:
The wire carries current of 10A. What is the magnetic field at the centre of the coil? Radius is 3cm.
Answer:
Magnetic field at the centre of a circular loop is-
B =μoI /2r (I is current , r is radius of loop, μo= 4π×10-7)
So, B=4π×10-7×10/ 2×0.03 (3cm = 0.03m)
= 20.93×10-5 T
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