A proton,moving west,enters a magnetic field.Because of this magnetic field the proton curves upward.We may conclude that the $\vec { B }$ field must have a component

Question

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The direction of the magnetic force on a moving charge is given by the right-hand rule. Since the proton (a positively charged particle) is moving west and curves upward, the magnetic field must have a component towards the south to create an upward force when applying the right-hand rule.

A Proton,moving West,enters a Magnetic Field B⃗\vec { B }B Field Must Have a Component A)towards the West

A Proton,moving West,enters a Magnetic Field $\vec { B }$ Field Must Have a Component
A)towards the West