Electrostatics

Section: Physics

Question : 1 of 59

Marks: +1, -0

A positive point charge of 10−8C is kept at a distance of 20 cm from the center of a neutral conducting sphere of radius 10 cm . The sphere is then grounded and the charge on the sphere is measured. The grounding is then removed and subsequently the point charge is moved by a distance of 10 cm further away from the center of the sphere along the radial direction. Taking ‌

4πε0

=9×109Nm2∕C2 (where ε0 is the permittivity of free space), which of the following statements is/are correct?

[JEE Adv 2025 P2]

Before the grounding, the electrostatic potential of the sphere is 450 V .
Charge flowing from the sphere to the ground because of grounding is 5×10−9C.
After the grounding is removed, the charge on the sphere is −5×10−9C.
The final electrostatic potential of the sphere is 300 V .

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