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## Homework Statement

A Student needs to construct a circuit in which there is a voltage drop of 5.0v across a resistance combination, and a total current of 2.0mA flowing through the combination. She has a 4000 Ohm ( 4.0kOhm) resistor which she wants to use and proposes to add another resistor in parallel with it.

## Homework Equations

a) What value should she use for the second resistor

b) Determine the effective resistance of the combination

## The Attempt at a Solution

I have no idea how to work this out. The answers are

a) 6.7 kOhms

b) 2.5 kOhms

I just need to know how to get to that answer