A particle of mass m carrying a charge q is placed in a vertical electric field so that it is suspended in air in equilibrium against gravity. The intensity of electric field is :
A
qmg
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B
qgm
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C
mgq
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D
mqg
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Solution
The correct option is Dmgq As the particle is in equilibrium net force on the particle should be zero (from the above free body diagram) Eq=mg