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Question

# A proton moving vertically downward enters a magnetic field pointing towards north. In which direction proton will deflect?EastWestNorthSouth

A
South
B
West
C
East
D
North
Solution
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#### Proton will represent the direction of current. So, the direction of current is vertically downward. According to Fleming's left hand rule, if middle finger represents the direction of current and fore-finger represents the direction of magnetic field then thumb will represent the direction of Lorentz force acting on the proton which deflects the proton in east direction.Hence, option A is correct.

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