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the rsistance of an ideal voltmeter and ideal ammeter respectively are zero and infinite infinite and infinite infinite and zero zero and zero

the rsistance of an ideal voltmeter and ideal ammeter respectively are 
 
  1. zero and infinite
  2. infinite and infinite
  3. infinite and zero
  4. zero and zero

Grade:12

1 Answers

Susmita
425 Points
5 years ago
The answer is infinite and zero.
Remember a voltmeter is connected in parallel to a resistance to measure the voltage drop across the resistance.To do so all of the current should flow through the resistance and not through the volmeter.This can be achieved if internal resistance of voltmeter is infinite because current always prefer a path of low resistance.
Whereas an ammeter is connected in series with the resistance to measure the current flowing through the resistance.Remember that current
I=V/R.If the ammeter has a finite internal resistane ,say,r,then the current in the circuit will change to
I"=V/(R+r).So we shall get wrong value of current.Therefore r must be zero.

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