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Q.

A particle initially moving towards south in a vertically downward magnetic field is deflected towards  the east. The sign of the charge on the particle is

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a

-ve

b

+ve

c

no change

d

Can't be determined

answer is B.

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Detailed Solution

Question Image

According to Right hand rule,

Stretch your middle finger along direction of magnetic field and force finger along the direction of charge and the thumb indicates the direction of force acting on a charge.

So in the given situation Thumb is showing towards East means Force acting on the charge is

towards East Right hand rule is used for + ve charge hence given charge is + ve

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