instruction:
You are given a sentence and your task is to generate another sentence that supports the given input.
question:
The magnetic field lines of a straight current-carrying wire form concentric circles around the wire.
answer:
The magnetic field produced by a  current in a wire moves in concentric circles.


question:
7 is exactly the middle of the pH scale and indicates neutral water.
answer:
Water is at the neutrality, 7 point on the ph scale.


question:
A pair of scissors is a compound machine.
answer:

Scissors are compound machines.