MCQ

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For two statements are given-one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions from the codes $\ce{(a), (b), (c)}$ and $(d)$ as given below :
Assertion : Magnetic field lines show the direction $($at every point$)$ along which a small magnetised needle aligns $($at the point$).$
Reason : Magnetic field lines certainly represent the direction of magnetic field, but not the direction of force, this is because force is always perpendicular to magnetic field $B.$

• A
  Both $A$ and $R$ are true, and $R$ is correct explanation of the assertion.
• ✓
  Both $A$ and $R$ are true, but $R$ is not the correct explanation of the assertion.
• C
  $A$ is true, but $R$ is false.
• D
  $A$ is false, but $R$ is true.