Explanation
Magnetic force acts on a moving charge.
When a charged particle having K.E. T is subjected to a transverse uniform magnetic field, it describes a circular path in the magnetic field without any change in its speed. Thus, the K.E. of the charged particle remains T at all times.
Because magnetic force on charge will be zero.
Because τ = NiAB cos θ
The magnetic field at centre will be zero due to equal currents in two halves. Current is divided equally due to the presence of equal resistance in both halves.
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