Magnetic field due to currentHard
Question
Two coaxial solenoids of different radii carry current I in the same direction. Let 
be the magnetic force on the inner solenoid due to the outer one and 
be the magnetic force on the outer solenoid due to the inner one. Then :
be the magnetic force on the inner solenoid due to the outer one and be the magnetic force on the outer solenoid due to the inner one. Then :Options
A.is radially inwards and = 0
is radially inwards and = 0B.is radially outwards and = 0
is radially outwards and = 0C.= = 0
= = 0D.is radially inwards and outwards.
is radially inwards and outwards.Solution
Field due to solenoid 2 outside the solenoid is zero
∴
Due to action reaction
or solenoid 2 behave as magnetic dipole
field of 1 is uniform ∴
f2 = 0
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