# If Two Resistors of 25 ω and 15 ω Are Joined Together in Series and Then Placed in Parallel with a 40 ω Resistor, the Effective Resistance of the Combination is : (A) 0.1 ω (B) 10 ω (C) 20 ω (D)40 ω - Science

If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is :

(a) 0.1 Ω
(b) 10 Ω
(c) 20 Ω
(d)40 Ω

#### Solution

(c) 20 Ω
When 25 Ω and 15 Ω are connected in series, then:
Total resistance, R = 25 + 15 = 40 Î
This 40 Î is connected in parallel with the 40 Î resistor.
Therefore, the net resistance = 40 / 2 = 20 Î

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#### APPEARS IN

Lakhmir Singh Class 10 Physics (Science)
Chapter 1 Electricity
Q 37