Magnetism Question 189
Question: Force between two identical bar magnets whose centres are r metre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to
[AIIMS 1995]
Options:
A) 2.4N
B) 1.2N
C) 0.6N
D) 0.3N
Show Answer
Answer:
Correct Answer: D
Solution:
In magnetic dipole, force $ \propto \frac{1}{r^{4}} $ Hence new force $ =\frac{4.8}{2^{4}}=\frac{4.8}{16}=0.3\ N $
BETA
