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Q. 8

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

Figure Q26.8 shows a negatively charged electroscope. The gold leaf stands away from the rigid metal post. Is the electric potential of the leaf higher than, lower than, or equal to the potential of the post? Explain.

The electric potential of the leaf is equal to the potential of the post

See the step by step solution

Step by Step Solution

Step 1 : Given information and formula used   

Given figure :

Theory used :

The electric field is zero inside a conductor. Just outside a conductor, the electric field lines are perpendicular to its surface, ending or beginning on charges on the surface. Any excess charge resides entirely on the surface or surfaces of a conductor.

Step 2 : Stating if the electric potential of the leaf higher than, lower than, or equal to the potential of the post 

A conductor in electrostatic equilibrium has the following properties:

1. The electric field is zero everywhere inside the conductor.

2. Any net charge on an isolated conductor must reside entirely on its surface.

So, the electric potential of the leaf is equal to the potential of the post

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