A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnet on one end. Which statement is correct about the energy stored in the magnetic field?
Responses
The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
The decrease in the energy stored in the system is proportional to the increase in kinetic energy. - not selected, this is the correct answer
The increase in the energy stored in the system is proportional to the increase in kinetic energy.
The increase in the energy stored in the system is proportional to the increase in kinetic energy. - incorrect
The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
The increase in the energy stored in the system is proportional to the decrease in kinetic energy. - no response given
The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.
The decrease in the energy stored in the system is proportional to the decrease in kinetic energy. - no response given
This is incorrect because the energy stored in the field decreases.
explain why this answer is correct
5 answers
Responses
increasing the current or using a higher-voltage power source
increasing the current or using a higher-voltage power source - no response given
increasing the number of turns in the coil of wire
increasing the number of turns in the coil of wire - no response given
increasing the distances between the turns of the coil
increasing the distances between the turns of the coil - not selected, this is the correct answer
using an iron core or nail
using an iron core or nail - incorrect
Using an iron core or nail will increase the magnetic field strength of an electromagnet.
explain why this answer is correct
Pair
Object 1 Charge
Object 2 Charge
A
-2
-1
B
-3
+1
C
+3
+1
D
+1
+2
Responses
Pair B
Pair B - not selected, this is the correct answer
Pair C
Pair C - incorrect
Pair D
Pair D - no response given
Pair A
Pair A - no response given
The objects in Pair C will have a repulsive electric force.
explain why this is the correct answer
In Pair C, both Object 1 and Object 2 have positive charges, which will result in a repulsive electric force between them, not an attractive force. Therefore, Pair C will have a repulsive electric force, not an attractive force.