Magnetic Effects Of Current Question 86
Question: A circular loop of radius 0.0157m carries a current of 2.0 amp. The magnetic field at the centre of the loop is $ ({\mu_{0}}=4\pi \times {{10}^{-7}},weber/amp-m) $ [MP PET 2000]
Options:
A) $ \text{1}\text{.57}\times \text{10}{{}^{\text{-5}}},weber/m^{2} $
B) $ 8.0\times \text{10}{{}^{\text{-5}}},weber/m^{2} $
C) $ 2.5\times \text{10}{{}^{\text{-5}}},weber/m^{2} $
D) $ \text{3}.14\times \text{10}{{}^{\text{-5}}},weber/m^{2} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ B=\frac{{\mu_{0}}}{4\pi }\frac{2\pi i}{r}={{10}^{-7}}\times \frac{2\pi \times 2}{0.0157}=8\times {{10}^{-5}}Wb/m^{2} $
BETA
