Exam

NTA Abhyas

Year

2020

Subject

Physics

Chapter

Magnetic Properties of Matter

NTA Abhyas 2020 · Physics · Magnetic Properties of Matter

Calculate the couple (in ) acting on a magnet of length 10cm and...

Calculate the couple (in $\muNm$) acting on a magnet of length $10cm$ and pole strength $15Am$, kept in a field of $B = 2 \times {10}^{- 5}T$ at an angle of $30 °$.

Step-by-step solution

$C = MBsin \theta$

$= \left(m \times 2l\right) \times 2 \times {10}^{- 5}\sin 30 °$

$= 15 \times 10 \times {10}^{- 2} \times 2 \times {10}^{- 5} \times \dfrac{1}{2}$



$= 15 \times {10}^{- 6}Nm$