From: Subject: Electrostatics (multiple choice questions) Date: Wed, 29 Dec 2004 09:50:33 -0500 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0000_01C4ED8B.D6D050F0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C4ED8B.D6D050F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://prkw.com/pmcestat.html Electricity - Electrostatics I
Multiple Choice Online Test
Indicate the correct = answer by=20 clicking on the button next to the numbers 1, 2, 3 or 4. There = is only=20 one correct answer per question. After you have answered=20 all multiple choice questions compare your choices = with=20 the correct answers.

Electrostatics I


1.) A plastic rod is rubbed with a dry = piece of cloth=20 and the rod becomes positively charged. The rod has ...=20
    1 gained electrons
    2 lost electrons
    3 gained protons
    4 lost protons
2.) A negatively charged rod will ...
    1 always point north-south when freely suspended.
    2 attract a negative charge.
    3 repel a negative charge
    4 repel a positive charge
3.) P and Q are metal spheres hanging from nylon threads. = When a=20 negatively charged rod is brought between them - as shown in the = diagram=20 to the right - P is repelled and Q is attracted by the rod. =
Which of=20 the following statements is correct?
    1 P must be negative.
    2 P must be positive.
    3 Q must be negative.
    4 Q must be a conductor.
 3D"electrostatics
4.) There is an = electrostatic=20 force of attraction between any two of three metal spheres P, Q and R. = A=20 possible combination for the charges on P, Q and R is =85
    1 P - positive  Q - negative  R - positive
    2 P - positive  Q - negative  R - neutral
    3 P - positive  Q - positive  R - positive
    4 P - neutral   Q - positive  R -=20 neutral
5.) Three metal spheres P, Q and R, on = insulated=20 stands carry charges as shown in the sketch. Q is now moved = towards P=20 and touches P. Q is then moved towards R and touches R, after = which Q is=20 returned to its original position.=20

3D"electrostatics=20
The charges on P, Q and R [in nC] are = now =85
      P Q R
    1 + 4,0 nC + 4,0 nC + 4,0 nC
    2 + 4,0 nC + 2,0 nC + 2,0 nC
    3 + 6,0 nC + 3,0 nC + 3,0 nC
    4 + 2,5 nC + 2,5 nC + 2,5 = nC
6.) In an experiment 4 plastic = Rods P, Q,=20 R, S are used. Each rod may be charged or uncharged. In tests, = it is=20 found that P repels Q but R exerts no force on S.
These = tests show=20 that ... 		3D"electrostatics
    1 P and Q are both positive.
    2 P and Q are both negative.
    3 P and Q have opposite charges.
    4 R and S are uncharged.
7.) Which of the diagrams below represents the = effect of=20 bringing a positively charged rod near (but not touching) an = electroscope.

3D"electrostatics
    1 1
    2 2
    3 3
    4 4
8.) An electroscope is negatively charged, with = the leaf at=20 an angle of about 45o. When a negatively charged rod is = slowly=20 brought near the plate of the electroscope, the leaf ...
    1 rises.
    2 falls.
    3 rises then falls.
    4 falls to zero then rises.
9.) An electroscope is negatively charged, with = the leaf at=20 an angle of about 45o. A metal ball on an insulating handle = is=20 slowly brought to (but not touching) the plate of the electroscope and = the=20 leaf falls.
This suggests that the metal ball is
    1 uncharged or positively charged.
    2 uncharged or negatively charged.
    3 positively charged.
    4 negatively charged.
10.) A pear shaped conductor stands on an = insulated=20 base as shown in the diagram at the right.

If the = conductor is=20 given some charge at P,
    1 all charge resides on the surface of the = conductor.
    2 the charge distribution is equal all over the = sphere.
    3 the charge density (amount of charge per unit area) is = highest at Q.
    4 the charge density is highest at = P.
3D"electrostatics
Results
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