Quiz

 

1.If there is a force of 5X10^-9N acting to the left on an electron, the electric field intensity at the location of

 

electron will be ___

Zero
8X10^-31 to the left
3.1X10⁷ N/C to the left
3.1X10⁷ N/C to the right

 

2.In 1 mole or 18gms of Water, the total negative charge of all the electrons is ___.

Zero, because it is electrically neutral
Less tham 1 C
Almost 100,000 C
Almost 1 million C

 

3.If a charge 'q' is placed at the centre of the line joining two equal point charges , each equal to +Q. This

 

system of 3 charges will be in equilibrium if 'q' is equal to ___

+Q
+Q/2
-Q/4
+Q/4

 

4.Electrical charge interaction can be summarized by ___

- charge repels other - charge
+ charge repels other + charge
- charge and + charge attract each other
All of these

 

5.Consider two point charges that are separated by a distance, 2r. If this distance between them is increased

 

to 5 r, the force between the charges is ___

1/25 as great as it had been
4/25 as great as it had been
1/9 as great as it had been
25 times as great as it had been

 

6.Consider three identical metal spheres that are mounted on insulating stands. Sphere X is neutral, sphere

 

Y has a charge -1q, and sphere Z has a charge +4q. X and Y are touched together and then separated ___

Each is now charged, with a charge -0.5 q
Each is now charged, with a charge -1 q
Sphere X is neutral, sphere Y has a charge -1q
Sphere X has charge -1 q, sphere Y is now neutral

 

7.Consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's Law:

 

if the charge on one of the particles is doubled, the force is ___

 

unchanged
halved
doubled
quadrupled

 

8.Consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's Law:

 

If, instead, the charge on both particles is doubled, the force is ___

unchanged
halved
doubled
quadrupled

 

9.Consider the electric force between a pair of charged particles a certain distance apart. By Coulomb's

 

Law:if instead the distance between the particles is halved, the force is ___

unchanged
halved
doubled
quadrupled

 

10.Point charges Q₁ = 1 nC and Q₂ = 2 nC are at a distance apart. Which of the following statements are

 

incorrect? ____

 

The force on Q₁ is repulsive.
The force on Q₂ is the same in magnitude as that on Qx.
As the distance between them decreases, the force on Q₁ increases linearly.
The force on Q₂ is along the line joining them.