A digital balance is used to measure ingredients in a laboratory. When a load is placed on the digital balance, an electronic circuit produces a current, which is then changed into a digital reading on the display. The electronic circuit produces a current of $2.0\,\text{mA}$ when a weight of $30\,\text{N}$ is applied, and a current of $0.5\,\text{mA}$ when a weight of $5\,\text{N}$ is applied. Which calibration curve might represent this circuit?
Physics 9702 · AS & A Level · Practical circuits