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Q.

An alpha particle projected towards the west is deflected towards the north by a magnetic field. The direction of the magnetic field is


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a

towards south

b

downward

c

towards east

d

upward 

answer is D.

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Detailed Solution

An alpha particle projected towards the west is deflected towards the north by a magnetic field. The direction of the magnetic field is upward.
According to Fleming's left-hand rule, "if the fingers are placed in such a way that the thumb is in the direction of force, the middle finger is in the direction of current (direction of motion of positively charged particle), then the forefinger indicates the direction of the magnetic field." In this situation, it would point perpendicularly upwards to the plane of the paper.
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An alpha particle projected towards the west is deflected towards the north by a magnetic field. The direction of the magnetic field is