Short Answer
A proton moving at 3 * 104 m/s is projected at an angle of 30 above a horizontal plane.If an electric field of 400 N/C is directed downwards,how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity. )[mProton = 1.67 *10 - 27 kg,qProton = +1.6 *10 - 19 C.]
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