Topic 6 Flashcards Preview

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Flashcards in Topic 6 Deck (20):
1

Two positive point charges P and Q are fixed at the points shown. The charge of P is greater than that of Q. M is the mid-point between the charges. 

The electric field due to the two charges will be zero at a point, other than at infinity, that is

A. to the left of P.

B. between P and M.

C. between M and Q.

D. to the right of Q.

Q image thumb

C. between M and Q. 

2

Two charged plastic balls in a vertical test tube are in equilibrium a distance d apart as shown. 

If the charge on each ball were to be doubled, the distance between the balls in the test tube would become

A. (2)1/2d

B. 2d.

C. 4d.

D. 8d.

Q image thumb

B. 2d

3

A positive test charge q is released near a positive fixed charge Q

As q moves away from Q, it will move with

A. constant velocity.

B. constant acceleration.

C. increasing acceleration.

D. decreasing acceleration.

D. decreasing acceleration

4

An electron and a proton start from rest near oppositely charged parallel plates in vacuum as shown.

Which of the following will be true of the kinetic energies of the two particles when they reach the opposite plates?

A. The proton will have the greater kinetic energy.

B. The electron will have the greater kinetic energy.

C. The kinetic energies of the two particles will be equal.

D. The kinetic energies of the two particles will be equal, but opposite in sign. 

C. The kinetic energies of the two particles will be equal. 

5

A charged oil drop is being observed between two horizontal parallel plates. The potential difference between the plates is adjusted so that the drop is at rest. 

The drop is observed to suddenly start moving upwards. What could be the reason for this?

A. The oil drop may have gained an electron.

B. The oil drop may have lost an electron.

C. The oil drop may have coalesced (joined) with another, uncharged, drop.

D. The source of potential difference may have been switched off

Q image thumb

B. The oil drop may have lost an electron. 

6

A positively charged rod is brought near to a neutral gold leaf electroscope and the leaf deflects as shown below.

Which line in the table below correctly indicates how the cap and leaf of the electroscope are now charged?

                           Cap                       Leaf

A.                       Negatiive              Negative

B.                       Negative              Positive

C.                      Negative                Neutral

D.                     Positive                    Neutral

Q image thumb

B. the cap is now negatively charged and the leaf is positively charged

7

A small positively charged sphere is moved between two points X and Y that are between two parallel charged plates. Three paths between X and Y are shown.

Which statement is correct?

A. Path 1 requires the most amount of work.

B. Path 2 requires the most amount of work.

C. Path 3 requires the most amount of work.

D. All the paths require the same amount of work.

Q image thumb

D. All the paths require the same amount of work.

8

A positively charged rod is placed near to the cap of an uncharged gold leaf electroscope. Which one of the following diagrams correctly shows the distribution of charges on the electroscope as well as the deflection of the gold leaf?

Q image thumb

B

9

Which one of the field patterns below could be produced by two point charges?

Q image thumb

C

10

A plastic rod is rubbed with a cloth. At the end of the process, the rod is found to be positively charged and the cloth is found to be uncharged. This involves the movement of

A. positive charge from the cloth to the rod.

B. positive charge from earth to the cloth.

C. negative charge from the rod to earth.

D. negative charge from earth to the cloth.

C. negative charge from the rod to earth. 

11

Two charges of –e and +4e are fixed at the positions shown below. At which position along the line XY is the electric field due to these charges equal to zero?

Q image thumb

A

12

Which one of the following is a correct definition of electric potential difference between two points?

A. The power to move a small positive charge between the two points.

B. The work done to move a small positive charge between the two points.

C. The power per unit charge to move a small positive charge between the two points.

D. The work done per unit charge to move a small positive charge between the two points.

D. The work done per unit charge to move a small positive charge between the two points.

13

Electric field strength is defined as

A. the force exerted on a test charge.

B. the force per unit positive charge.

C. the force per unit charge.

D. the force per unit charge exerted on a positive test charge.

D. the force per unit charge exerted on a positive test charge.

14

Two positive point charges P and Q are held a certain distance apart.

At which point(s) could the electric field strength, due to the charges, be zero?

A. X only

B. Y only

C. Z only

D. X and Z only

Q image thumb

B. Y only

15

Two isolated spheres X and Y of unknown materials are touching one another as shown below

Sphere Y is negatively charged and sphere X is earthed. The earth connection is removed from sphere X and then the spheres are separated as shown below. 

Sphere X is found to be positively charged and sphere Y remains negatively charged.

Which of the following describes the nature of the materials from which the spheres are made?

Q image thumb

C. Sphere X is a conductor, Sphere Y is an insulator

16

The diagram below shows two parallel conducting plates that are oppositely charged.

The line XY is perpendicular to the plates.

Which of the following diagrams shows the variation along the line XY of the magnitude E of the electric field strength between the plates?

Q image thumb

D

17

The leaf and cap of an uncharged gold-leaf electroscope are shown below.

A positively charged rod is brought near to the cap of the electroscope.

Which diagram best shows the distribution of charge on the electroscope?

Q image thumb

D

18

The electric field strength at a point may be defined as

A. the force exerted on unit positive charge placed at that point.

B. the force per unit positive charge on a small test charge placed at that point.

C. the work done on unit positive charge to move the charge to that point from infinity.

D. the work done per unit positive charge to move a small test charge to that point from infinity.

B. the force per unit positive charge on a small test charge placed at that point. 

19

The diagram below shows a positively charged rod brought near an isolated uncharged metal plate.

As a result of bringing the rod near to the plate,

A. the metal plate will gain a charge dependent on the separation of the rod and the plate.

B. the metal plate will remain uncharged.

C. the metal plate will gain a negative charge.

D. the metal plate will gain a positive charge. 

Q image thumb

B. the metal plate will remain uncharged. 

20

A proton and an alpha particle are accelerated from rest from the positively charged plate X to the negatively charged plate Y.

At the mid-point between the plates, the proton has a kinetic energy EK. At this point, the alpha particle has a kinetic energy

A. EK/2 .

B. EK .

C. 2EK .

D. 4EK .

Q image thumb

C. 2EK