A particle having charge 10*10-6C and mass 1*10-6 moves in a horizontal circle of radius 10 cm under the influence of a magnetic field of 0.1 T. When the particle is at a point P, a uniform electric field is switched on so that the particle starts moving along the tangent with uniform velocity. The electric field is -
1. 0.1V/M 2. 1.0V/M 3. 10.0 V/M 4. 100 V/M

force applied by magnetic field = force applied by electric field.qvB = qEE = vBandmv2r = qvBv  = qrB/mE= qrB2mE= 10-5×0.1×0.1×0.110-6E  = 0.01 v/m

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