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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 :

F1=F2=0F1is radially inwards andF2is radially outwardsF1is radially inwards and F2=0F1is radially outwards and F2=0

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