WB JEE 2017 | Electrostatics Question 36 | Physics | WB JEE - ExamSIDE.Com

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1

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+2

-0.5

A unit negative charge with mass M resides at the mid-point of the straight line of length 2a adjoining two fixed charges of magnitude +Q each. If it is given a very small displacement x(x << a) in a direction perpendicular to the straight line, it will

A

come back to its original position and stay there

B

execute oscillations with frequency $${1 \over {2\pi }}\sqrt {{Q \over {2\pi {\varepsilon _0}M{a^3}}}} $$

C

fly to infinity

D

execute oscillations with frequency $${1 \over {2\pi }}\sqrt {{Q \over {2\pi {\varepsilon _0}M{a^2}}}} $$

2

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+1

-0.25

A hollow metal sphere of radius R is charged with a charge Q. The electric potential and intensity inside the sphere are respectively

A

$${Q \over {4\pi {\varepsilon _0}{R^2}}}$$ and $${Q \over {4\pi {\varepsilon _0}R}}$$

B

$${Q \over {4\pi {\varepsilon _0}R}}$$ and zero

C

zero and zero

D

$${{4\pi {\varepsilon _0}Q} \over R}$$ and $${Q \over {4\pi {\varepsilon _0}{R^2}}}$$

3

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+1

-0.25

Angle between an equipotential surface and electric lines of force is

A

0$$^\circ$$

B

90$$^\circ$$

C

180$$^\circ$$

D

270$$^\circ$$

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