Which of the following is NOT a conductor? a. human body b. moisture c. silver d

Question

Which of the following is NOT a conductor? a. human body b. moisture c. silver d. plastic When silk is used to charge a glass rod, the glass obtains a net positive charge. Therefore we know that the silk has _______ charge. a. a net positive b. a net negative c. no net When a black plastic rod is rubbed by fur, it acquires a net negative charge of 10^5 C. Therefore, we can conclude that the fur a. acquired a net negative charge significantly less than 10^-5 C. b. also acquired a net negative change of 10^-4C. c. a acquired a net positive charge significantly less than 10^-5 C. d. acquired a net positive charge of 10^-5 C. d. acquired a net positive charge of 10^-5 C. Two charged objects are very, very far from any other charges. If the distance between them is doubles, the electric force between them a. doubles, b. is cut in half. c. is 1/4th as large. d. quadruples. Points A and B have electric potentials of 12 V and 20 V, respectively. How much work would be required to take 3 C of positive charge from A to B? a. zero b. 24 J c. 36 J d. 60 J Points A and B each have an electric potential of +12 V. How much work would be require take 3 C of positive charge from A to B? a. zero b. 3J c. 9 J d. 36 J

Explanation / Answer

(1) Plastic is not a conductor
(2) Since glass obtain negative charge that means the slik looses some electron which is gained by the glass rod.
hence the silk will have net positive charge.
(3) As explained above the net positive charge on the fur will be equal to 10-5 C.
hence the correct option is D.
(4)Electric force is inversely proportional to the square of the distance between the charges.
hence when you double the distance between the charges then the force becomes 1/4 time.
Hence correct option is C.
(5) We know that work done = Charge*potential difference = 3*(20-12) = 24 J
hence correct option is B.
(6) Since there potential difference is ZERO.
therefore the work done to move the charge will be zero.
hence correct option is A.

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