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Question

A uniform magnetic field is directed out of the page. A charged particle, moving in the plane of the page, follows a clockwise spiral of decreasing radius as shown, then

A
the charge is positive and slowing down
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B
the charge is negative and slowing down
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C
the charge is positive and speeding up
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D
the charge is negative and speeding up
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Solution

The correct option is A the charge is positive and slowing down
R=mvqB;F=q(v×B)

As R decreases, v will decrease.

Clockwise motion for upward magnetic field +ve charge.

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