The r.m.s. value of the potential difference V shown in the figure is:
1.
2.
3.
4.
(A) | When the capacitor is air filled. |
(B) | When the capacitor is mica filled. |
1. | \(V_A>V_B\) |
2. | \(V_A<V_B\) |
3. | \(V_A=V_B\) |
4. | it can't be predicted. |
1. | 2. | ||
3. | 4. |
1. | voltage across the capacitor lags behind the current. |
2. | voltage across the inductor leads the current. |
3. | voltage across \(\text{R}\) is in phase with the current. |
4. | all of the above. |
1. | 2. | ||
3. | 4. |
Assertion (A): | A glowing bulb becomes dim when an iron bar is put in the inductor in series LR ac circuit. |
Reason (R): | Resistance of circuit increases. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | When ac circuit contains resistor only, its power is minimum. |
Reason (R): | Power of a circuit is independent of phase angle. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are False. |
Assertion (A): | A transformer cannot work on a steady DC supply. |
Reason (R): | Steady DC changes neither in magnitude nor in direction. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
1. | 2. | ||
3. | 4. |