A capacitor and a coil in series are connected to a 6 volt ac source. By varying the frequency of the source, maximum current of 600 mA is observed. If the same coil is now connected to a cell of emf 6 V and internal resistance of 2 Ω, the current through it will be

Question

A capacitor and a coil in series are connected to a 6 volt ac source. By varying the frequency of the source, maximum current of 600 mA is observed. If the same coil is now connected to a cell of emf 6 V and internal resistance of 2 Ω, the current through it will be (A) 0.5 A (B) 0.6 A (C) 1.0 A (D) 2.0 A

Tardigrade Admin · Accepted Answer

The maximum current is obtained at resonance where the net impedance is only resistive which is the resistance of the coil only. This gives the resistance of the coil as 10 Ω. Now, this coil along with the internal resistance of the cell gives a current of 0.5 A.

Q. A capacitor and a coil in series are connected to a 6 volt ac source. By varying the frequency of the source, maximum current of $600 m A$ is observed. If the same coil is now connected to a cell of emf $6 V$ and internal resistance of $2 Ω$ , the current through it will be

0.5 A

0.6 A

1.0 A

2.0 A

The maximum current is obtained at resonance where the net impedance is only resistive which is the resistance of the coil only. This gives the resistance of the coil as $10 Ω$ . Now, this coil along with the internal resistance of the cell gives a current of $0.5 A$ .

Q. A capacitor and a coil in series are connected to a 6 volt ac source. By varying the frequency of the source, maximum current of 600mA is observed. If the same coil is now connected to a cell of emf 6V and internal resistance of 2Ω, the current through it will be