Work Module #1 Quiz

$Q_{1\ }=-0.10\mu C$  Is located at the origin.   $Q_{2\ }=+0.10\mu C$  Is located on the positive x axis at x = 1.0 m.  Which of the following is true of the force on $Q_1$  due to  $Q_2$  

• It is attractive and directed in the +x direction

• It is attractive and directed in the -x direction.

• It is repulsive and directed in the +x direction

• It is repulsive and directed in the -x direction

Fred the lightning bug has a mass m and a charge +q. Jane, his lightning bug wife, has a mass of  $\frac{3}{4}m$  And a charge of  -2q.  Because they have charges of opposite sign, they are attracted to each other.  Which is attracted more to the other,  and by how much?

• Fred, twice as much

• Jane, twice as much

• Fred, four times as much

• Jane, four times as much

• They are attracted to each other by the same amount

As an object acquires a positive charge, its mass usually

• Decreases

• Increases

• Stays the same

• Becomes negative

A small metal ball hangs from the ceiling by an insulating thread. The ball is attracted to a positively charged rod held near the ball. The charge of the ball must be

• Positive

• negative

• Neutral

• Positive or neutral

• Negative or neutral

How many electrons make up a charge of -48 $\mu C$ ?

•  $3\times10^{20}electrons$  

•  $3\times10^{14}\ electrons$  

•  $3.3\times10^{-15}\ electrons$  

•  $7.7\times10^{-24}electrons$  

What is the repulsive electrical force between two protons  $4.0\times10^{-15}m$  apart from each other in an atomic nucleus?

•  $9.011\times10^{19}N$  

•  $14.4\ N$  

•  $1.6\times10^{-9}N$  

•  $1.28\times10^{-59}N$