Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Questions  >  R1 = ?​a)25 Ωb)50 Ωc)100 &O... Start Learning for Free
R1 = ?​
  • a)
    25 Ω
  • b)
    50 Ω
  • c)
    100 Ω
  • d)
    2000 Ω
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
R1 = ?​a)25 Ωb)50 Ωc)100 Ωd)2000 ΩCorrec...
Voltage across 60 Ω resistor = 30 V
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Most Upvoted Answer
R1 = ?​a)25 Ωb)50 Ωc)100 Ωd)2000 ΩCorrec...
Let the current in the loop is I
so 70V=IR1+IR2;
IR1=50V;  --->(1)

now the potential between 60 ohms resistor is 30V
By ohms law 
I=30V\60=0.5A;
now substitute I in equation (1);
we get;
R1=100ohms
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R1 = ?​a)25 Ωb)50 Ωc)100 Ωd)2000 ΩCorrect answer is option 'C'. Can you explain this answer?
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