A resistor and an ideal inductor are connected in series to an ideal battery hav
ID: 3278517 • Letter: A
Question
A resistor and an ideal inductor are connected in series to an ideal battery having a constant terminal voltage V_0. At the moment contact is made with the battery. (a) the voltage across the resistor is A) V_0. B) V_0/e. C) V_0/2. D) zero. (b) the voltage across the inductor is A) V_0 B) V_0/e C) V_0/2. D) zero. Which of the following statements about inductors are correct? There may be more than one correct choice. A) When it is connected in a circuit, an inductor always resists having current flow through it. B) Inductors store energy by building up charge. C) When an inductor and a resistor are connected in series with a DC battery, the current is the circuit is reduced to zero in one time constant. D) An inductor always resists any change in the current through it. E) When an inductor and a resistor are connected in series with a DC battery, the current in the circuit is zero after a very long time.Explanation / Answer
20) B. The current flowing in long straight conductor will induce a current in the metallic ring such that the current will oppose the current causing it, according to Farday's law. So, if the current in straight conductor is in clockwise direction, current in metallic will flow in counter clockwise direction to oppose it.
21) (a) D. When the contact is made with the battery, whole volatge will drop across the resistor because of its ideal nature, that is because of resistance being infinite. So, the voltage across the resistor is zero.
(b) A. Similarly, being ideal inductor, it will allow whole voltage to cross across it and hence the voltage across the inductor is V0
22) B. Inductors store charges in the form of energy and hence the correct option is B.
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