1. Tardigrade
  2. Question
  3. Physics
  4. 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

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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 $600\, mA$ is observed. If the same coil is now connected to a cell of emf $6\, V$ and internal resistance of $2\, \Omega$, the current through it will be

Alternating Current

Solution:

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 $10\, \Omega$. Now, this coil along with the internal resistance of the cell gives a current of $0.5\, A$.