NEET2019PhysicsCurrent ElectricityActual
In the circuits shown below, the readings of the voltmeters and the ammeters will be,
Options
- AV 2 > V 1 and i 1 = i 2
- BV 1 = V 2 and i 1 > i 2
- CV 1 = V 2 and i 1 = i 2
- DV 2 > V 1 and i 1 > i 2
Correct answer
C. V 1 = V 2 and i 1 = i 2
Step-by-step solution
For an ideal voltmeter, resistance is infinite R V = ∞ , so it will not draw any amount of current from the circuit and for ideal ammeter resistance is zero. Then for the first figure R 1 = 10   Ω ,   R V = ∞ and both are in a parallel arrangement, so 1 R eq = 1 R 1 + 1 R V ⇒ 1 R eq = 1 10 + 1 ∞ ⇒ R eq   =   10   Ω and current in the first circuit is, i 1 = V 1 R eq = 10 10 =   1   A So, for the first circuit, ammeter and voltmeter readings