Magnetism Question 237
Question: Two isolated point poles of strength 30 A-m and 60 A-m are placed at a distance of 0.3m. The force of repulsion is
Options:
A) $ 2\times {{10}^{-3}}N $
B) $ 2\times {{10}^{-4}}N $
C) $ 2\times 10^{5}N $
D) $ 2\times {{10}^{-5}}N $
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ F=\frac{{\mu _{0}}}{4\pi }\frac{m _{1}m _{2}}{r^{2}}={{10}^{-7}}\times \frac{30\times 60}{{{(0.3)}^{2}}}=2\times {{10}^{-3}},N $
BETA
