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Question

Three resistors 2 Ω, 3 Ω and 4 Ω are connected in series in a circuit. The total resistance of the circuit is


A

7 Ω

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B

8 Ω

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C

9 Ω

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D

10 Ω

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Solution

The correct option is

B

9 Ω Given: Resistances,

R1=2 ΩR_1 = 2 ~ΩR1=2 Ω, R2 =3 ΩR_2 = 3 ~ΩR2 =3 Ω and R3 =4 ΩR_3 = 4 ~ΩR3 =4 Ω.

When all the resistors are in series, equivalent resistance of the circuit, Re=R1+R2+R3=2+3+4=9 ΩR_e = R_1 + R_2 + R_3 = 2 + 3 + 4 = 9 ~ΩRe=R1+R2+R3=2+3+4=9 Ω.


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