Current Electricity and Electrical InstrumentHard
Question
In the following circuit, the resistance of a voltmeter is 10,000 Ω and that of an ammeter is 20 Ω . If the reading of an ammeter is 0.1 amp. and that of voltmeter is 12 volt, then the value of R is :-
Options
A.122 Ω
B.100 Ω
C.118 Ω
D.116 Ω
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
When an ammeter of negligible internal resistance is inserted in series with circuit it reads 1A. When the voltmeter of ...Two weirs each of radius cross section r but of different materials are connected to gather end to end (in series). If t...Three voltmeters, all having different resistances, are joined as shown. When some potential difference is applied acros...A cell of internal resistance 1Ω is connected across a resister. A voltmeter having variable resistance is used to ...Three copper wires of lengths and cross sectional areasare (l,A), (2l,A/2) and(l/ 2,2A). Resistance is minimum in...