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26 Nov 2019

True/False?
1. Resistance is a property of an object while resistivity isaproperty of a material.
2. Increasing the length of a conductive wire lowers theresistance ofthe wire.
3. Increasing the diameter of conductive wires lowers theresistanceof the wires
4. Ohm'sLaw is true for all electronic devices.
5. Ohm'slaw is true when the resistivity of a material isindependent ofthe applied electric field.

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Collen Von
Collen VonLv2
29 Jun 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

True/False?
1. Ohm's Law isvalid when for a given piece of material theratio V/I is the samefor a wide range of voltages andcurrents.
2. For anOhmic conducting material the resistivity depends onthe electricfield and the current density.
3. Acurrent of 0.5 A exists in a 60-Ohm lamp. The appliedpotentialdifference is 30V.
4. Avoltage V is applied to a device of resistance R and thecurrentthrough the device is i. If the device obeysOhm’s law,then the current will increase to 2iif the voltage is increased to2V
5. Theends of wire A are connected to the terminals of abattery andthere is current in the wire. If the wire A is replacedwithanother wire, B, which has two times smaller resistivity thanA,the resulting current in B will be twice larger than the currentinA.
True orFalse?
1. Theresistance of a metal rod depends on temperature.
2. Theresistance of a metal rod does not depend onitsconductivity.
3. Theresistance of a metal rod with fixed cross-sectionalarea dependson the shape of the cross sectional area.
4. Acylindrical copper rod has resistance R. It is reformed totwiceits original length with no change of volume. Its newresistance isequal to 2R.
5. Acertain wire has a resistance R. Another wire, made of thesamematerial, has half the length and half the diameter of thefirstwire. The resistance of the second wire is equal toR.

Four wires are made of the same highly resistive material, cut to the same length, and connected in series.

  • Wire 1 has resistance R1 and cross-sectional area A.
  • Wire 2 has resistance R2 and cross-sectional area 2A.
  • Wire 3 has resistance R3 and cross-sectional area 3A.
  • Wire 4 has resistance R4 and cross-sectional area 4A.

A voltage V0 is applied across the series, as shown in the figure. Find the voltage V2 across wire 2.

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