Questions
In the given circuit, the voltmeter records 5 volt. The resistance of the voltmeter in ohms is
detailed solution
Correct option is B
Let R be the resistance of voltmeter as shown in figThe resultant ,resistance of the circuitRresultant =R×100R+100+50=R×100+50×(R+100)(R+100)=150R+5000R+10′0The current flowing ir.t the circuiti=10V[(150R+5000) ′(R+100)]The voltage across AB, i.e., V' is given by V′=i×RAB=10[(150R+5000)/(R+100)]×R×100R+1005=10150R+5000×(R×100)Solving, we get R = 100 ΩTalk to our academic expert!
Similar Questions
Two cells of the same e.m.f. e but different internal resistances,R1 and R2, are connected in series with an external resistance R. The potential drop across the first cell is found to be zero. The external resistance R [Fig.] is
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