Answer:
Since the positively charged
particle (alpha-particle) projected towards west, so the direction of current
is towards west. Now the deflection is .towards north, so the force is towards
north.
Now
hold the forefinger, centre finger and thumb of our left-hand at right angles
to one another. Let us adjust the hand in such a way that our centre finger
points towards west and thumb points towards north. If we look at our forefinger,
it will be pointing upward. Thus, the magnetic field is in the upward direction.
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