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A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire is suspended vertically in a uniform magnetic field of strength 0.2 Weber/m2. The coil carries a current of 2 A. If the plane of the coil is inclined at an angle of 30° with the direction of the field, the torque required to keep the coil in stable equilibrium will be :

  • Option 1)

    0.20 Nm

  • Option 2)

    0.24 Nm

  • Option 3)

    0.12 Nm

  • Option 4)

    0.15 Nm


Answers (1)


As learnt in concept

Deflecting torque -

T_{def}=NBiAsin 	heta

	heta =90^{circ}


- wherein

Deflecting torque always has the maximum value 


 T=NIASin\theta=SO\times 20\times 0.12\times 0.2\times\frac{\sqrt{3}}{2}


Option 1)

0.20 Nm

This is correct answer

Option 2)

0.24 Nm

This is incorrect answer

Option 3)

0.12 Nm

This is incorrect answer

Option 4)

0.15 Nm

This is incorrect answer

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