Two coaxial solenoids of different radii carry current I in the same direction. Let F⃗₁ be the magnetic force on the inner solenoid due to the outer one and F⃗₂ the magnetic force on the outer solenoid due to the inner one. Then:
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Question

Two coaxial solenoids of different radii carry current I in the same direction. Let F⃗₁ be the magnetic force on the inner solenoid due to the outer one and F⃗₂ the magnetic force on the outer solenoid due to the inner one. Then:

Options

G1 Physics · Accepted Answer

Each ideal long solenoid produces a uniform axial field inside and essentially zero external field. The coaxial arrangement has no net translational magnetic force on either solenoid. Therefore F⃗₁=F⃗₂=0, option C.