Question

The resistance coils in a resistance box are made of double folded wire so that their

• A. self induction effect in nullified
• B. self inductance is maximum
• C. induced emf is maximum
• D. None of these

Answer 1

The correct option is A self induction effect in nullified

Presence of inductance increases the impedance more than the actual resistance value. Therefore to reduce the chance of occurrence of inductance in the resistor coils, they are double folded, so that current in opposite direction cancel the induced flux linkages if any and hence inductance is nullified.