An electron moving to the east in a horizontal plane is deflected towards south by a magnetic field. The direction of this magnetic field is

Towards north

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Towards west

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Downwards

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Upwards

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Solution

The correct option is C Downwards
Answer is C.

An electron moving to the east in a horizontal plane is deflected towards south by a magnetic field. When the direction of the electron is from west to east, the current is in the reverse direction. That is, the current is in the east-west direction. Applying the right-hand thumb rule, we get that the direction of magnetic field at a point below the wire is from north to south. That is, downwards.

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Question 3
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
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(b) towards east
(c) downward
(d) upward

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