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Two coaxial solenoids of different radii carry current I in the same direction. Let F1 be the magnetic force on the inner solenoid due to the outer one  and F2 be the magnetic force on the outer solenoid due to the inner one. Then 
  1. F1 = F2=0
  2. F1 is radially inwards and F2=0 
  3. F1 radially outwards and F2=0
  4. F1 is radially inwards and F2 is radially outwards


Solution

The correct option is A F1 = F2=0
Consider the two coaxial solenoids. Due to one of the solenoids magnetic field at the centre of the other can be assumed to be constant.

Due to symmetry, forces on upper and lower part of the solenoid will be equal and opposite and hence resultant is zero.

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