In the circuit shown, R 1 = 10 ?, R 2 = 100 ?, and R 3 = 1000 ?. The wires in th
ID: 1356901 • Letter: I
Question
In the circuit shown, R1 = 10 ?, R2 = 100 ?, and R3 = 1000 ?. The wires in the circuit are ideal (have no resistance) but the battery has a small internal resistance.
Which of the following statements about R3 is (are) true?
Select all answers that are correct.
Question 3 options:
I3 is zero because the current goes through the path of least resistance.
I3 is zero. The voltage across R3, ?V3, is zero because all the potential is used up in the internal resistance of the battery, R1, and R2.
?V3 is greater than ?V1 and ?V2 because R3 has the largest resistance.
?V3 is smaller than ?V1 and ?V2 because R3 has the largest resistance.
I3 will decrease if R1 is removed from the circuit.
I3 will increase if R2 is removed from the circuit.
None of the above.
A)I3 is zero because the current goes through the path of least resistance.
B)I3 is zero. The voltage across R3, ?V3, is zero because all the potential is used up in the internal resistance of the battery, R1, and R2.
C)?V3 is greater than ?V1 and ?V2 because R3 has the largest resistance.
D)?V3 is smaller than ?V1 and ?V2 because R3 has the largest resistance.
E)I3 will decrease if R1 is removed from the circuit.
F)I3 will increase if R2 is removed from the circuit.
G)None of the above.
Explanation / Answer
here R1,R2 and R3 are in parallel
potential drop across each resistor is same
I = I1+I2+I3
if R1 is removed then I1 = 0
hence the I3 will increase
similarly if R2 is removed then I2 = 0
then I will increase
So the correct statement is
F)
I3 will increase if R2 is removed from the circuit.