Q120 / 180 · NEET 2015 (Phase 2) · Physics

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:

  • A
    0.25 A
  • B
    2 A
  • C
    1 A
  • Correct answer
    D
    0.5 A

Solution

Figure

Resistance of ammeter =480×20480+20=19.2Ω

i=3040.8+19.2=0.5 A

Hence, the correct answer is option: 'D'.

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