Magnetic Effects Of Current Question 200
Question: Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force one wire exerts on the other per metre of length is [CBSE PMT 1997; AFMC 1999]
Options:
A) $ 2\times {{10}^{-4}}N $ , attractive
B) $ 2\times {{10}^{-4}}N $ , repulsive
C) $ 2\times {{10}^{-7}}N $ , attractive
D) $ 2\times {{10}^{-7}}N $ , repulsive
Show Answer
Answer:
Correct Answer: A
Solution:
$ F=\frac{{\mu_{0}}}{4\pi }\frac{2i_{1}i_{2}}{a}={{10}^{-7}}\times \frac{2\times 10\times 10}{0.1}=2\times {{10}^{-4}}N $ Direction of current is same, so force is attractive.
BETA
