Magnetic Effects Of Current Question 125
Question: 20 ampere current is flowing in a long straight wire. The intensity of magnetic field at a distance 10 cm from the wire will be [Pb. PMT 2003]
Options:
A) 4 ´ 10?5 Wb/m2
B) 9 ´ 10?5 Wb/m2
C) 8 ´ 10?5 Wb/m2
D) 6 ´ 10?5 Wb/m2
Show Answer
Answer:
Correct Answer: A
Solution:
$ B=\frac{{\mu_{0}}}{4\pi }.\frac{2i}{r}={{10}^{-7}}\times \frac{2\times 20}{10\times {{10}^{-2}}}=4\times {{10}^{-5}}Wb/m^{2} $
BETA
