An electron is placed in vacuum in uniform electric field E, then for balancing of electron, magnitude and direction of electric field will be ( 
)
A
, vertically upward B
, vertically downward C
, vertically upward D
, vertically downward
Text Solution
Verified by ExpertsThe correct answer is:
C
Given, 
Charge of an electron, 
mass of an electron, 
As we know, 
So, the magnitude of the electric field is approximately 
.
Since the electric field oppose the gravitational force. Therefore, the direction of the electric field will be opposite to the direction of the gravitational field, which is upwards.
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