A positive charge in a magnetic field moves in a circular path on the screen as shown, what is the direction of the magnetic field?

To the left.

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Into the screen.

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To the right.

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Out of the screen.

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Solution

The correct option is D Into the screen.
At the point where arrow is shown , the centripetal force on positive charge is toward left , which is provided by magnetic force and velocity of positive particle is toward the top of screen (tangent to the point) , which can be considered as direction of current . Now by applying Fleming's left hand rule for given current and force directions we find direction of magnetic field into the screen.

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