what is the direction of the field in --An electron, moving downwards into plane of the page, experiences a force directed vertically
into the plane of the page left to right upward.

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Solution

The electron experiences the force in the upward direction and moves in the downward direction this means the current will flow in the upward direction (opposite to the direction of the flow of the electron). Now using the right hand thumb rule one can easily say that the field to produce this effect will have to be in ANTI-CLOCKWISE DIRECTION.

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What is the direction of the net force on the particle due to the fields at the instant it enters?

An electron beam enters a magnetic field at right angles to it as shown in the figure.

The direction of force acting on the electron beam will be :

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