Read the introduction from a science website
Which focus question is the author trying to answer?
Electromagnetic force sounds very complicated, but I
wanted to understand how it works. My experiment allowed
me to create my own electrical field using a nine-volt
battery, an iron nail, and some paperclips. This experience
helped me understand electromagnetism and the way it
works
O How does a nine-volt battery work?
O How does electromagnetic force Work?
O How much electricity is stored in a battery?
O How much iron is contained in paperclips?

How does electromagnetic force work?

Explanation:

I took the test and got it correct.

B

Explanation:took the test

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

a sonic boom is a loud boom that breaks the sound barrier

explanation: