True/False? 1. Ohm\'s Law isvalid when for a given piece of material the ratio V

Question

True/False? 1. Ohm's Law isvalid when for a given piece of material the ratio V/I is the samefor a wide range of voltages and currents. 2. For anOhmic conducting material the resistivity depends on the electricfield and the current density. 3. Acurrent of 0.5 A exists in a 60-Ohm lamp. The applied potentialdifference is 30V. 4. Avoltage V is applied to a device of resistance R and the currentthrough the device is i. If the device obeysOhm’s law, then the current will increase to 2iif the voltage is increased to 2V 5. Theends of wire A are connected to the terminals of a battery andthere is current in the wire. If the wire A is replaced withanother wire, B, which has two times smaller resistivity than A,the resulting current in B will be twice larger than the current inA. True/False? 1. Ohm's Law isvalid when for a given piece of material the ratio V/I is the samefor a wide range of voltages and currents. 2. For anOhmic conducting material the resistivity depends on the electricfield and the current density. 3. Acurrent of 0.5 A exists in a 60-Ohm lamp. The applied potentialdifference is 30V. 4. Avoltage V is applied to a device of resistance R and the currentthrough the device is i. If the device obeysOhm’s law, then the current will increase to 2iif the voltage is increased to 2V 5. Theends of wire A are connected to the terminals of a battery andthere is current in the wire. If the wire A is replaced withanother wire, B, which has two times smaller resistivity than A,the resulting current in B will be twice larger than the current inA. 1. Ohm's Law isvalid when for a given piece of material the ratio V/I is the samefor a wide range of voltages and currents. 2. For anOhmic conducting material the resistivity depends on the electricfield and the current density. 3. Acurrent of 0.5 A exists in a 60-Ohm lamp. The applied potentialdifference is 30V. 4. Avoltage V is applied to a device of resistance R and the currentthrough the device is i. If the device obeysOhm’s law, then the current will increase to 2iif the voltage is increased to 2V 5. Theends of wire A are connected to the terminals of a battery andthere is current in the wire. If the wire A is replaced withanother wire, B, which has two times smaller resistivity than A,the resulting current in B will be twice larger than the current inA.

Explanation / Answer

the answer is 1. True 2. False 3. True 4. True 5. True

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