Magnetic Effects Of Current Question 105
Question: A long straight wire carries a current of $ \pi ,amp. $ The magnetic field due to it will be $ 5\times {{10}^{-5}}weber/{{m}^{\text{2}}} $ at what distance from the wire $ [{\mu_{o}}= $ permeability of air] [MP PMT 2002]
Options:
A) $ 10^{4}{\mu_{o}} $ metre
B) $ \frac{10^{4}}{{\mu_{o}}} $ metre
C) $ 10^{6}{\mu_{o}} $ metre
D) $ \frac{10^{6}}{{\mu_{o}}} $ metre
Show Answer
Answer:
Correct Answer: A
Solution:
$ B=\frac{{\mu_{0}}}{2\pi }\frac{i}{r}\Rightarrow 5\times {{10}^{-5}}=\frac{{\mu_{0}}}{2\pi }\times \frac{\pi }{r}\Rightarrow r=10^{4}{\mu_{0}}\ metre $
BETA
