Physics-
General
Easy

Question

A candidate connects a moving coil ammeter A and a moving coil voltmeter V blank and a resistance R as shown in figure

If the voltmeter reads 20 V and the ammeter reads 4 blank A comma blank t h e n blank R is

  1. Equal to 5 capital omega    
  2. Greater than 5 capital omega    
  3. Less than 5 capital omega    
  4. Greater or less than 5 capital omega blankdepending upon its material    

The correct answer is: Greater than 5 capital omega


    Here, i equals 4 A semicolon V equals 20 blank Volt; so,
    R equals fraction numerator V over denominator I end fraction equals fraction numerator 20 over denominator 4 end fraction equals 5 A. Since, voltmeter is connected in parallel with resistance R comma the effective resistance of this combination is 5 capital omega only if the resistance R is greater than 5capital omega, since total resistance in parallel combination becomes less than individual resistance

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