Oersted discovered a connection between electricity and magnetism when he observed:
A. the motion of a compass needle.
B. a light flickering.
C. a current-carrying wire heating up.
D. a current-carrying wire vibrating.

"the motion of a compass needle." (option A)

Explanation:

Oersted found that when conducting an electrical current through a wire, it was creating a magnetic field that affected a compass near by, and made the compass; needle to change position.

Therefore the correct answer is option A:

"the motion of a compass needle."

in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!