A charged particle with velocity V and charge Q enters a region of magnetic fiel

Question

A charged particle with velocity V and charge Q enters a region of magnetic field B as shown in the figure. It exits this region a distance L below its entry point. a) What is the mass of the particle? b) Is the charge on the particle positive or negative?

A charged particle with velocity V and charge Q enters a region of magnetic field B as shown in the figure. It exits this region a distance L below its entry point. a) What is the mass of the particle? b) Is the charge on the particle positive or negative?

Explanation / Answer

F= q(vxB)

vxB direction is upwards but shown movement is downwards i.e. charge is negative

for circular motion

mv^2/r = qvB

r=mv/qB

m=rqB/v

r=L/2

m=LqB/2v

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