Which of the following statements are correct about the electrical resistance and resistivity of a wire? 1. Both quantities depend on the area of cross-section of the wire 2. Both depend on the temperature 3. Resistance of the wire is directly proportional to the resistivity of the wire 4. Resistivity of the wire is directly proportional to the length of the wire Select the correct answer using the code given below :

We are given three copper wires of different lengths and different areas of cross-section. Which one of the following would have highest resistivity?

Which of the following statements correctly explain the existence of a positive force between two electric charges? 1. Both the charges are positive. 2. Both the charges are negative. 3. Both the cha…

Given below are two statements, in which one is labelled as Assertion (A) and the other as Reason (R): Assertion (A) : A person travelling in a car with closed glass windows and doors is safe from th…

A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?

With reference to the electric potential which of the following statements is incorrect?