Question SPM.2.HL.TZ0.5
| Date | May Specimen-2023 | Marks available | [Maximum mark: 7] | Reference code | SPM.2.HL.TZ0.5 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Discuss, Outline, State | Question number | 5 | Adapted from | N/A |
Two conducting rings, A and B, have their centres on the same line. The planes of A and B are parallel. There is a constant clockwise current in A. Ring A is stationary and ring B moves towards ring A at a constant speed.
Outline why the magnetic flux in ring B increases.
[1]
ring B cuts an increasing number of magnetic field lines ✓
OR
magnetic field from current in A increases at the position of B ✓
State the direction of the induced current in ring B.
[1]
counterclockwise ✓
The graph shows how the magnetic flux in ring B varies with time.
Discuss the variation with time of the induced current in ring B.
[3]
the rate of change of «magnetic» flux in B increases
OR
The gradient of the graph is increasing with time ✓
Faraday’s law states that the induced emf in B will «therefore» increase ✓
so induced current will increase because resistance of ring is constant ✓
Outline why work must be done on ring B as it moves towards ring A at a constant speed.
[2]
the current induced in B gives rise to a magnetic field opposing that of A
OR
there will be a magnetic force opposing the motion ✓
work must be done to move B in the opposite direction to this force ✓