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# A particle of mass 1×10−26kg and charge 1.6×10−19C travelling with a velocity 1.28×106 ms−1 along the positive X−axis enters a region in which there is a uniform electric field →E=−102.4×103 kNC−1 and magnetic field →B=8×10−2^j Wbm−2 , the direction of motion of the particles is :along the negative X-axis.at 45o to the positive X-axis.along the positive X-axis.at 135o to the positive X-axis.

A
along the positive X-axis.
B
along the negative X-axis.
C
at 135o to the positive X-axis.
D
at 45o to the positive X-axis.
Solution
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#### Force acting on the particle when it enters in the electric field & magnetic field is

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