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# To Determine Resistance per cm of a Given Wire By Plotting a Graph of Potential Difference Versus Current - Physics Practical Class 12 Viva Questions with Answers

1. Define Ohm’s law.

Answer. The current that flows through most conductors is directly proportional to the voltage applied. The voltage across a conductor is directly proportional to the current flowing through it, provided all physical conditions and temperatures remain constant.

1. What is the formula of Ohm’s law?

Answer. Ohm’s law is given by the formula: V=IR

Where, I=current, V=volatge, and R=Resistance.

1. What is specific resistance?

Answer. The resistance offered per unit length and unit cross-sectional area when a known amount of voltage is applied is known as the specific resistance.

1. What is the SI unit of the potential difference?

Answer. The SI unit of the potential difference is volt.

1. The current is measured in which unit?

Answer. The unit of electric current is Ampere.

1. What is the unit of resistance?

Answer. The unit of the electrical resistance is Ohms.

1. Does the resistance depend on the temperature?

Answer. Yes, the resistance depends on the temperature. As the temperature increases, the resistance also increases.

1. What are the various sources of error while performing this experiment?

Answer: Various sources of error are:

• The instrument screws may be loose.
• Lack of thick connecting wires.
• Using rheostat of high resistance.
1. What is electrical conductivity?

Answer. It is the measure of the ability of the material to allow the electric current to pass through it.

1. Define a rheostat.

Answer. A rheostat is a two-terminal electrical device. The rheostat is a variable resistor whose resistance can be changed to change the current flowing amount through a circuit.

1. State true or false: The potential difference across the wire varies linearly with the current.

Answer. TRUE. The potential difference across the wire varies linearly with the current.

1. Does the resistance depend on the dimensions of the conductor?

Answer. Yes, the resistance depends on the dimensions of the conductor.