Two statements are given - one labelled Assertion (A) and the other labelled Reason \((R)\). Select the correct answer from the codes (A), (B), (C) and (D) as given below.

Assertion (A) : A proton and an electron enter a uniform magnetic field \(\vec{B}\) with the same momentum \(\vec{p}\) such that \(\vec{p}\) is perpendicular to \(\vec{B}\). They describe circular paths of the same radius.

Reason (R): In a magnetic field, orbital radius r is equal to \(\frac{ p }{ qB }\).

Question

Two statements are given - one labelled Assertion (A) and the other labelled Reason \((R)\). Select the correct answer from the codes (A), (B), (C) and (D) as given below.

Assertion (A) : A proton and an electron enter a uniform magnetic field \(\vec{B}\) with the same momentum \(\vec{p}\) such that \(\vec{p}\) is perpendicular to \(\vec{B}\). They describe circular paths of the same radius.

Reason (R): In a magnetic field, orbital radius r is equal to \(\frac{ p }{ qB }\).

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