3. Why did Cavendish use a telescope to observe the deflection of the rod?
He needed a way to magnify the rod.
He needed a way to make the rod look smaller.
He needed a way to observe the rod from a distance.
He needed a way to move the rod.
4. Magnetism was another potential source of error. The source of the magnetic field Cavendish
was concerned about was-
the enclosure around his apparatus.
Earth.
the metal balls and rods.
The air currents.
5. What did Cavendish discover with respect to the temperature of the balls in his experiment?
It had no effect.
It could be a source of error.
It was better to use balls at many different temperatures.
It was better to freeze balls before using them.
6. Experiments exploring sources of error-
were performed only by scientists working before 2000.
have been performed only by contemporary scientists.
are considered unimportant with modern instruments.
are important for most scientific studies.
resistors and three 9.5 
