Four bulbs B 1 , B 2 , B 3 and B 4 of 100   W each are connected to 220   V main as shown in the…



Four bulbs B1, B2, B3 and B4 of 100 W each are connected to 220 V main as shown in the figure. The reading in an ideal ammeter will be
  1. 0.90 A
  2. 1.35 A
  3. 0.45 A
  4. 1.80 A

Solution

The resistance of any bulb=V2/P

Current through ammeter at shown position=3i1

current in any 1 bulb=i1=VR=VV2/P=PV=100220

Through ammeter, ⇒inet=3i1=300220=1.35 A

Asked in: JEE Main 2014 (19 Apr Online)

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