Question

The decrease of resistance in parallel combination is due to:

• A. the decrease in effective area of the cross-section
• B. the increase in effective area of the cross-section
• C. The decrease in effective length .
• D. None of the above

Answer 1

The correct option is B

the increase in effective area of the cross-section

When two resistors are connected in parallel, the effective area of cross-section through which the current can pass, increases. Since, the resistance of a wire is given by

i.e., inversely proportional to the area of cross-section. Therefore, any increase in area of cross-section decreases the resistance.