Question

Two physical quantities are represented by P and Q. The dimensions of their product is $M^2{L}^4{T}^{-4}{I}^{-1}$ and the dimensions of their ratio is $I^1$. Then P and Q respectively are :

• A. Magnetic flux and Torque acting on a Magnet
• B. Torque and Magnetic flux
• C. Magnetic Moment and Polestrength
• D. Magnetic Moment and Magnetic permeability

Answer 1

The correct option is B Torque and Magnetic flux

$P\times Q=M^2{L}^4{T}^{-4}{I}^{-1}$

$\frac{P}{Q}=I^1$

$\Rightarrow P=M^1{L}^2{T}^{-2}$

$Q=M^1{L}^2{T}^{-2}{I}^{-1}$

Magnetic flux $=M^1{L}^2{T}^{-2}{I}^{-1}$

Torque $=M^1{L}^2{T}^{-2}$

Hence, option B is correct.