Discussion
A 200 Ω resistor is connected in parallel with another 200 Ω resistor. What will be the effective resistance of the parallel connection?
Answer: C
The effective resistance is 100 Ω. For two equal resistors in parallel, the total is half of one resistor.
\[ R = \frac{200 \times 200}{200 + 200} = 100\ \Omega \]
The values 25 Ω and 50 Ω are too low for two 200 Ω resistors in parallel, and 150 Ω is not what a parallel combination gives (the result of a parallel connection is always less than the smaller resistor, 200 Ω). So the third option is correct.
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