Homework Answers
Magnetic force on a moving charge in magnetic field is given by:
F = q*VxB
Direction of force on charged particle is given by right hand rule:
According to this if we point our thumb towards the direction of motion and fingers towards the direction of magnetic field than direction of palm will be direction of force on a positive charged particle and direction of back side of palm will direction of force on the negative charge.
Now in given case if we point our thumb in North direction and fingers in downward direction, then backside of our palm (Since charge is negative) will be into the page, So Direction of force on negative charge (electron) particle will be towards East.
Correct option is B.
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