PH 202

Quiz # 02 (10 pts)

Name

Solution

 

A  charge has an electrical potential energy of  at a certain point in space.  What is the value of the electric potential field (V) at that point in space?

 

A.

B.

C.

 

D.

 

 

 

 

So Correct Answer is A

 

Two charges  and , are located as shown in the diagram on the right.  What is the electric potential V at location C?

 

A.

B.

C.

 

D.

 

 

For a point charge,

When you have more than one

 

 

 

 

 

So Correct Answer is A!

 

An electron is accelerated from rest by a potential difference of 50.0 V.  What is the final speed of the electron after it has passed through this potential difference?

 

A.

C.

 

 

 

 

B.

D.

 

Conservation of energy gives us:

Solving for v

 

So Correct Answer is C!

 

 

The surface in the picture above marked by the dotted line, is a Gaussian surface.  What is the net electric flux  passing out of this surface?

 

A.

B.

C.

 

D.

 

 

Add up the charges enclosed in the surface

 

 

So the Correct Answer is D!

 

The figure to the left shows a pair of thin conducting spherical shells.  The outer one has a radius  and has a net excess charge of .  The inner one has a radius  and has a net excess charge of .  What is the expression for the electric field  at a point r as shown?

 

A.

C.

 

 

 

 

B.

D.

 

We can use Gauss’s law.  For our Gaussian surface we would use a sphere of radius r as shown below:

 

Since the charge is negative  points inward!

 

 

So Correct answer is A!

 

 

 

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This page last updated on September 9, 2020