HARD
JEE Main
IMPORTANT
Earn 100

An alpha particle (the nucleus of a helium atom) has a mass of 6.64×10-27 kg and a charge of +2e . What are the (a) magnitude and (b) direction of the electric field that will balance the gravitational force on the particle? (c) If the field magnitude is then doubled, what is the magnitude of the particle's acceleration? 

Important Questions on Electric Fields

HARD
JEE Main
IMPORTANT

Figure (a) shows a non-conducting rod with a uniformly distributed charge +Q. The rod forms a half-circle with radius R and produces an electric field of magnitude Earc at its center of curvature P. If the arc is collapsed to a point at a distance R from P (Fig. b), by what factor is the magnitude of the electric field at P multiplied? 

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(a)                                                                             (b)