When a charged particle moving with velocity V→ is subjected to a magnetic field of induction B→ the force on it is non-zero. This implies that

Force on a particle moving with velocity v in a magnetic field B is F=q(V→×B→) If angle between V→ & B→ is either zero or 180º, then valueof F will be zero as cross product of V→ and B→ will be zero. So option (b) is correct.

When a charged particle moving with velocity V→ is subjected to a magnetic field of induction B→ the force on it is non-zero. This implies that

Force on a particle moving with velocity v in a magnetic field B is F=q(V→×B→) If angle between V→ & B→ is either zero or 180º, then valueof F will be zero as cross product of V→ and B→ will be zero. So option (b) is correct.

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When a charged particle moving with velocity $\vec{V}$ is subjected to a magnetic field of induction $\vec{B}$ the force on it is non-zero. This implies that

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angle between $\vec{V}$ and $\vec{B}$ can have any value other than 90°

angle between $\vec{V}$ and $\vec{B}$ can have any value other than zero and 180°

angle between $\vec{V}$ and $\vec{B}$ is either zero or 180°

angle between $\vec{V}$ and $\vec{B}$ is necessarily 90°

answer is B.

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Detailed Solution

Force on a particle moving with velocity v in a magnetic field B is $F = q (\vec{V} \times \vec{B})$ If angle between $\vec{V}$ & $\vec{B}$ is either zero or 180º, then value
of F will be zero as cross product of $\vec{V}$ and $\vec{B}$ will be zero. So option (b) is correct.