In an electric circuit, two resistors with resistances J and K are connected in parallel. In this case, if L is the combined resistance of these two resistors, then the reciprocal of L is equal to the sum of the reciprocals of J and K. What is L in terms of J and K? Select the correct option
A) J/K  B) K/J  C) J+K  D) JK/(J + K)  E) NONE OF THESE
The wording is a bit confusing, though basically we are told that 1/L= 1/J + 1/K, from which it follows that L=JK/(J + K).   Answer: JK/(J + K)
<result>D</result>
In an electric circuit, two resistors with resistances J and K are connected in parallel. In this case, if L is the combined resistance of these two resistors, then the reciprocal of L is equal to the sum of the reciprocals of J and K. What is L in terms of J and K?