MCQ
Two statements are given-one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.Assertion $(A):$ Magnetic moment is measured in joule/ tesla or amp $m ^2$. Reason $( R )$ : Joule/ tesla is equivalent to amp $m ^2$.
  • Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
  • B
    Both $A$ and $R$ are true but $R$ is $\text{NOT}$ the correct explanation of $A.$
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false and $R$ is also false.

Answer

Correct option: A.
Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$

Magnetlcmoment $=\frac{\text{joule}}{\text{tesla}}=\frac{\text{w}}{\text{B}}=\frac{\text{W}}{\frac{\text{F}}{\text{qu}}}$
$=\frac{\text{Wqv}}{\text{F}}=\frac{[\text{ML}^2\text{T}^{-2}][\text{AT}][\text{LT}]^{-1}}{[\text{MLT}^{-2}]}$
$=\text{AL}^2=\text{amp m}^2$

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