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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Physics
Chapter: Magnetic Properties of Matter

NTA Abhyas 2020 · Physics · Magnetic Properties of Matter

A bar magnet of length 10 cm and pole strength 2Am makes an angle...

A bar magnet of length

10

cm and pole strength

2Am

makes an angle

{60}^{o}

with a uniform magnetic field of induction

50T

. The couple acting on it is

Options

A $5\sqrt{3}Nm$
B $\sqrt{3}Nm$
C $10\sqrt{3}Nm$
D $20\sqrt{3}Nm$

Correct answer

A. $5\sqrt{3}Nm$

Step-by-step solution

C = \left(2l\right)mBsin \theta

= 1 {0}^{- 1} \times 2 \times 5 0 \times \dfrac{\sqrt{3}}{2}

= 5 \sqrt{3} \text{N m}

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