An electron (mass 9 10 -31 kg and charge 1.6 10 -19 C ) moving with speed c/100 ( c = speed of light) is injected into a magnetic field B of magnitude 9 10 -4 T perpendicular to its direction of motion. We wish to apply an uniform electric field E together with the magnetic field so that the electron does not deflect from its path. Then (speed of light c = 3 10 8 ms -1 )

1. A. E is parallel to B and its magnitude is 27 10 4 V m -1
2. B. E is perpendicular to B and its magnitude is 27 10 4 V m -1
3. C. E is perpendicular to B and its magnitude is 27 10 2 V m -1
4. D. E is parallel to B and its magnitude is 27 10 2 V m -1

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