Question

Force between two identical bar magnets whose centers are rmetre apart is 4.8 N when their axes are in the same line. If the separation is increases to 2rmetre, the force between them is reduced to

• A. 2.4 N
• B. 1.2 N
• C. 0.6 N
• D. 0.3 N

Answer 1

Answer: (D)

0.3 N

Answer 2

Force between two bar magnet $F \propto \frac { 1 } { d ^ { 4 } }$⇒

Where d= separation between magnets.