Questions
An electric field is acting vertically upwards. A small body of mass 1 gm and charge - is projected with a velocity 10 m/s at an angle with horizontal. Its horizontal range is 2m then the intensity of electric field is : (g = 10 )
detailed solution
Correct option is C
As charge is negative and the electric field is vertically upwards the total force acting on the charge is vertically downwards. Hence the net acceleration downwards is g+qEmR=V2sin2θg+qEm=V2g+qEmθ=45oR=10010+10−6E10−3=10+10−3E=50E=40×103 N/CSimilar Questions
An electron falls through a small distance in a uniform electric field of magnitude 2 x 104NC-1.The direction of the field is reversed keeping the magnitude unchanged and a proton falls through the same distance. The time of fall will be
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