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NEET2015PhysicsCurrent ElectricityActual

A circuit contains an ammeter, a battery of 30 v and a resistance 40.8 ohm all connected in series. If the ammeter has coil of resistance 480 ohm and a shunt of 20 ohm, the reading in the ammeter will be:

Options

  1. A0.25 A
  2. B2 A
  3. C1 A
  4. D0.5 A

Correct answer

D. 0.5 A

Step-by-step solution

Resistance of ammeter = 480 × 20 480 + 20 = 19.2 Ω i = 30 40.8 + 19.2 = 0.5   A

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