A student wishes to make the magnetic force exerted by the electromagnet shown below greater.
image e0200808b8fa436fae6f573f2546fa05
Which procedure step could the student follow to accomplish this goal?
A.
increase the length of wire at location 1
B.
open the switch at location 2
C.
add more batteries in series at location 3
D.
reduce the number of wire turns at location 4
what is the correct option?
C. add more batteries in series at location 3
A student places a drop of purple food coloring into one beaker of water at 20°C and another drop into another beaker of water at 50°C. The temperature of the food coloring is 19°C. The picture shows what he observes.
What explains what the student observes in this investigation? Select all that apply.
A.
The food coloring moves faster in hot water.
B.
The food coloring moves slower in hot water.
C.
The food coloring is denser than the cold water.
D.
The food coloring is less dense than the cold water.
E.
The food coloring separates into two different colors.
F.
The food coloring increases the temperature of the water.
what are the correct options?
A. The food coloring moves faster in hot water.
C. The food coloring is denser than the cold water.