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Byju's Answer

Standard XII

Physics

Analysis of Force Equation

An oil drop o...

Question

An oil drop of mass m and charge $+ q$ is balanced in vacuum by a uniform electric field of intensity $E$ The direction of this field should be

vertically up.

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vertically down.

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horizontal.

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inclined at

45^{o}

to the horizontal.

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Solution

The correct option is A vertically up.
$m g = q E$
$E$ should be upward to balance downward $m g$ .

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An oil drop of mass m and charge +q is balanced in vacuum by a uniform electric field of intensity E The direction of this field should be

The correct option is A vertically up.mg=qEE should be upward to balance downward mg.

An oil drop of mass m and charge $+ q$ is balanced in vacuum by a uniform electric field of intensity $E$ The direction of this field should be

The correct option is A vertically up.
$m g = q E$
$E$ should be upward to balance downward $m g$ .