Suppose an alpha-particle with a positive charge enters from south to north in a magnetic field at the right angle if the direction of the magnetic field is west-east. In which direction will the particle experience the force?

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Downward direction

Upward direction

Parallel to magnetic field

Parallel to the current direction

answer is A.

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Detailed Solution

Suppose an alpha-particle with a positive charge enters from south to north in a magnetic field at the right angle if the direction of the magnetic field is west-east. As a result, the particle experienced a force in a downward direction.
According to Fleming's left-hand rule, if we stretch our forefinger, middle finger, and thumb perpendicular to each other, then the forefinger will indicate the direction of the magnetic field, the middle finger- the direction of current, and the thumb will indicate the direction of the force. So the direction of the force will be downward in the above case.

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