Question

# The diagram below shows a positively charged particle moving toward the right and about to enter a magnetic field whose direction is shown by the blue arrows. What is the direction of the force on the positively charged particle (from our point of view) at the instant it enters the magnetic field?

A
right
B
left
C
up
D
toward us
E
away from us
Solution
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#### Index finger represent the magnetic field which is downwards and the charge particle moving in right direction hence the current moving in left direction. Now we can predict the direction of the force by applying Fleming left hand rule which is away from us.

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