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.