2. Questions Bank
  3. JEE Main & Advanced
  4. Physics
  5. Magnetism

JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    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]

    A)            2.4N                                         

    B)            1.2N

    C)            0.6N                                         

    D)            0.3N

    Correct Answer: D

    Solution :

                       In magnetic dipole, force \[\propto \frac{1}{{{r}^{4}}}\] Hence new force \[=\frac{4.8}{{{2}^{4}}}=\frac{4.8}{16}=0.3\ N\]


You need to login to perform this action.
You will be redirected in 3 sec spinner