1.

Four particles enter a region of uniform magneticfield. Their trajectories are shown in figure. Whatare the signs of the charge of all four particles?

Answer»

for a positive charge... using right hand thumb rule the

IN THE FIGURE

if the magnetic field is downward (×) , and velocity is from left to right.. , then the magnetic force will be such that the particle will move in anticlockwise...( force will be upward)...

here for A.. it is following clockwise path.. to charge will be -ve..

same goes for B too.. it is also -ve

for C it is following anticlockwise path.. so, +ve charge..

and D is going undeflected.. so , D is neutral..



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