Energy changes when charges or magnets move in a field
Grade 11 Science Worksheet - Building Confidence
Circle the best answer, or write your answer on the line.
An average pull of 2 N separates two attracting magnets by 0.05 m. How much energy is stored in their field, Ari?
An average pull of 0.8 N separates two attracting magnets by 0.03 m. How much energy is stored in their field, Bo?
An average pull of 4.5 N separates two attracting magnets by 0.02 m. How much energy is stored in their field, Esme?
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Energy bar chart (example data), one bar per energy store, height in J. Touching: field energy 0 J; kinetic 0 J. Pulled 4 cm apart and held: field energy 0.06 J; kinetic 0 J. Let go, just before they meet: field energy 0 J; kinetic 0.06 J. Two magnets attract, north pole facing south pole; field lines run from the north pole to the south pole between them.
In the energy bar chart, how much energy is stored once the magnets are pulled 4 cm apart, Jun?
- 0.24 J
- 0 J
- 0.06 J
In the energy bar chart, where did the stored field energy come from, Luz?
- The magnets' weight
- The work done pulling them apart
- Heat from the room
A positive and a negative charge are pulled farther apart. What happens to the energy in their field, Milo?
- It increases
- It stays the same
- It is released
Two attracting magnets are let go and snap together. What happens to their field energy, Noah?
- It stays the same
- It increases, since they pull harder
- It is released
Two magnets are pushed together with north facing north. What happens to their field energy, Pia?
- It drops to zero
- It is released
- It increases
Around a bar magnet, which way do the field lines point outside it, Ren?
- Straight up from the middle
- From the north pole to the south pole
- From the south pole to the north pole
Which way do electric field lines run between a positive and a negative charge, Zee?
- From positive to negative
- From negative to positive
- In circles around each charge