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NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Magnetic Effects of Current

NEET 2015 · Physics · Magnetic Effects of Current

A rectangular coil of length 0.12m and width 0.1m having 50 turns...

A rectangular coil of length 0.12m0.12\text{m} and width 0.1m0.1\text{m} having 5050 turns of wire is suspended vertically in a uniform magnetic field of strength 0.20.2 Weber/m2Weber / {m}^{2} . The coil carries a current of 2A2\text{A}. If the plane of the coil is inclined at an angle of 30o{30}^{o} with the direction of the field, the torque required to keep coil in stable equilibrium will be:A rectangular coil of length 0.12m and width 0.1m having 50 turns of wire is suspended vertically in a uniform magnetic

Options

  1. A0.20Nm0.20Nm
  2. B0.24Nm0.24Nm
  3. C0.12Nm0.12Nm
  4. D0.15Nm0.15Nm

Correct answer

A. 0.20Nm0.20Nm

Step-by-step solution

A rectangular coil of length 0.12m and width 0.1m having 50 turns of wire is suspended vertically in a uniform magnetic

τ→=M→×B→=MBsin60o\overset{\to}{τ} = \overset{\to}{M} \times \overset{\to}{B} = MBsin {60}^{o}

=NiABsin60o= NiABsin {60}^{o}

=50×2×0.12×0.1×0.2×32= 50 \times 2 \times 0.12 \times 0.1 \times 0.2 \times \dfrac{\sqrt{3}}{2}

=123×10−2Nm=0.20748Nm= 12\sqrt{3} \times {10}^{- 2}Nm = 0.20748Nm
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