zing/user/attempt/quiz start frame.d21?ou 39658808isprv-8idrc-08qi-16170218cfql-

Question

zing/user/attempt/quiz start frame.d21?ou 39658808isprv-8idrc-08qi-16170218cfql-08dnb-0 r Plex physics for Scientists r Facebook-Log in o Quicklinks l Universi e Home Cheggcom a, University Physics IIv https://outlook.offic Kelly Chen IVERSITY PHYSICS II tent Activities Calendar Grades Classlist Class Progr ress Resources Practice Quiz 02-Physics 202 -spring 2018 -Quiz Kelly Chen: Attempt 1 Two conductors A and B of the same lenght and radius are connected across the same voltage source. Conductor A has twice the resistance of B. Which conductor dissipates more power? O a) Same O b) Can't tell 10 O d) A 4 15 Save 9 20 Question 2 (1 point) When the voltage across a certain conductor is doubled, the current is observed to be halved. What can you conolude about the conductor? O a) lt is not an Ohmic material O b) It is an Ohmic material O o) The rate of flow of charge is not equal to the current is such a conductor O d) Can't tel Save Question 3 (1 point) A current of 2 A flows through a certain copper wire connected to a voltage source. If the surrounding temperature of the copper wir falls, what current will flow through the copper wire? O a) Can't tell O b) More than 2 A O d) Less than 2 A Save

Explanation / Answer

1. given two conductors of same radius and length, connected across same voltage

Ra = 2Rb

hence

P = V^2/R

hence resistance will more resistance dissipates less power

hence

Rb dissipates more power

c) B

2. when, voltage is doubled, current is halved

this means

V = k/I

where k is constant of integration

gebce

VI = k

this is not ohms law

hence the conductor is not an ohmic conductor

a)

3. i = 2 A

the temerature falls, hence resistance of the copper wire falls, hence current in the circuit increases

b) more than 2A

4. as the pocket comb has net charge, hence when it moves along with the person in space, it creates electric current

hence

b) yes

5. at constant temerature, radius is halved, cross section is 1/4th

hence resistance becomes 4 times

c) Quadrupled

6. household appliance cathces fire

this can happend because there was no fuse in the sustem to prevent excess current

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