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  4. A charge +Q is moving upwards vertically. It enters a magnetic field directed to north. The force on the charge will be towards

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Q. A charge $+Q$ is moving upwards vertically. It enters a magnetic field directed to north. The force on the charge will be towards

KCETKCET 2010Moving Charges and Magnetism

Solution:

A positive charge is moving vertically upwards.when it enters a region of magnetic field directed towards north, what is the direction of the force on charge. Using this $[\overrightarrow{ F }= q (\overrightarrow{ v } \times \overrightarrow{ B })]$ equation, and right hand rule, we find that the force acts in West direction.