Question

Consider the following statements :
(a) The specific resistance does not depend on the dimensions of a conductor.
(b) The combined resistance of any number of resistors connected in series is equal to the sum of the individual resistors.
(c) A good conductor of electricity offers more resistance.
(d) The resistance of a wire decreases with the increase in its temperature.
Which of the above statements are correct?

• A. (a) and (b)
• B. (b) and (c)
• C. (a),(b) and (d)
• D. (a),(b),(c) and (d)

Answer 1

The correct option is A (a) and (b)

Answer is A.
Electrical resistivity or specific resistance is an intrinsic property that quantifies how strongly a given material opposes the flow of electric current. A low resistivity indicates a material that readily allows the movement of electric charge. That is, the number or density of free electrons in the conductor which the nature of the conductor.
Components connected in series are connected along a single path, so the same current flows through all of the components. The current through each of the components is the same, and the voltage across the circuit is the sum of the voltages across each component. In a series circuit, every device must function for the circuit to be complete. One bulb burning out in a series circuit breaks the circuit. A circuit composed solely of components connected in series is known as a series circuit.The total resistance of resistors in series is equal to the sum of their individual resistances. That is, R(total)=R1+R2+R3.
Therefore, the statement in option A and B are correct.