Q.

When a positive charge is moving upwards in a magnetic field directed towards the north, the particle will be deflected towards


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a

west

b

north

c

south

d

east 

answer is A.

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Detailed Solution

When a positive charge is moving upwards in a magnetic field directed towards north, the particle gets deflected towards the west.
The magnetic field is towards the north if the positive charge moves upwards. Now, if the thumb, the forefinger and the middle finger of the left hand are stretched mutually perpendicular to each other such that the forefinger points towards the direction of the magnetic field, the middle finger points in the direction of the current, then the thumb indicates the direction of force experienced by the conductor. Hence, from Fleming’s left-hand rule, it can be said that the particle will be deflected towards the west.
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