Question

A circuit when connected to an AC source of
12 V gives a current of 0.2 A. The same circuit
when connected to a DC source of 12 V, gives a
current of 0.4 A. The circuit is
[NEET-2019 (Odisha)]
(1) Series LCR (2) Series LR
(3) Series RC
(4) Series LC​

Answer 1

The given circuit is a series LR circuit. Correct option is (2)

Explanation:

• When the circuit is connected to an AC source of 12 V, it gives a current of 0.2 A.
• When the same circuit is connected to DC source of 12 V, the current obtained is 0.4 A.
• That means at zero frequency (DC source), the total resistance or impedance of the circuit reduces.
• Therefore the given circuit is a series LR circuit.

Hence, correct option is (2), Series LR circuit.

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Supposed a 6 volt battery is connected across a lamp whose resistance is 20 ohm through a variable resistor .in figure 16 if the current in the circuit is 0.25 A calculate the value of the resistances from the resistor which must be used ?

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Answer 2

The given circuit is Series LR circuit.

Explanation:

• When the circuit is connected to an AC source of 12 V gives a current of 0.2 A.

• When the same circuit is connected to DC source of 12 V, the current obtained is 0.4 A.

We can see that while using a DC which measures only with resistance ,the current increased ie, In AC , current was lagged behind v

So we can say that the given circuit is a series LR circuit.

Hence, correct option is (2)