A particle of charge +q and mass m moving under the influence of a uniform electric field 
and a uniform magnetic field 
follows trajectory from P to Q as shown in figure. The velocities at P and Q are 
and 
respectively. Which of the following statement(s) is/are correct
Text Solution
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(a, b, d)
Kinetic energy of the particle at point 
K.E. of the particle at point 
Increase in K.E. 
It comes from the work done by the electric force qE on the particle as it covers a distance 2a along the x-axis. Thus 
. The rate of work done by the electric field at P 
At 
is along x-axis while velocity is along negative y-axis. Hence rate of work done by electric field 
Similarly, according to equation 
Force 
is also perpendicular to velocity vector 
.
Hence the rate of work done by the magnetic field = 0
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