Multiple choice

A direct voltage of 240 V is applied to a uniform 200 ohm resistor abc. A 40 ohm resistor is connected across the part ab. Find the resistance ab in order that 1 A flows in the 40 ohm resistor.

  1. 71.65 ohm

  2. 85.32 ohm

  3. 33.33 ohm

  4. 40 ohm

  5. -
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A Correct answer
Explanation

Let the resistance of part ab of potential divider be of R ohm. 200/(200 - R) = 40 R +1 R = 71.65 ohm 

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