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Two striaght long parallel conductors ca...

Two striaght long parallel conductors carry currents `I_1 and I_2` in the same direction. Deduce the expression for the force per unit length between them.
Depict the pattern of magnetic field lines around them.
(b) A rectangular current carrying loop EFGH is kept in a uniform magnetic field as shown in the fig.
(i) What is the direction of the magnetic moment of the current loop ?
(ii) When is torque acting on the loop (A) maximum, (B) zero?

Text Solution

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(b) (i) The direction of the magnetic moment of the current loop is perpendicular to plane of loop EFGH and points in-wards into the paper.
(ii) The torque acting on the loop is maximum when the loop EFGH is along the direction of magnetic field B due to magnet NS. The torque on the loop is zero when the loop EFGH is at right angle to hte direction of magnetic field B.
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