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WorksheetsIB Physics Topic 11 Revision
Total questions: 36
Worksheet time: 22mins
Which description best applies to Lenz's Law?
An induced current occurs when a magnet passes through a tube.
When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.
The direction of an induced current is such to align with the change that created it.
A magnet is a tube is always slowed by its magnetic field.
What happens to the galvanometer if the copper rod is moved upwards?
No change
Deflect to the right
Deflect to the left
Deflect to the right and left
Which activity will produce the highest current?
Move the magnet bar into the coil while the coil remains stationery
Move the coil into the magnet bar while the magnet remains stationery
Move the coil and magnet towards each other
Move the coil and magnet away from each other
Which action will increase the deflection of the galvanometer pointer?
The magnetic pole is reversed
The number of turns of coils is increased
The coil is made from insulated wire
The magnet is slowly pushed into the coil
A transformer consists of
Metal Core
Metal core and coiled wire
Metal core and polymer wire
Polymer core and metal wire
Transformer is device that
converts AC voltage to current
converts electrical energy to kinetic energy
converts AC voltage to a different level at the same amplitude
converts AC voltage to a different level at the same frequency
Select the facts about transformer.
Will not work with DC and AC
Will not work with DC
AC will produce change in magnetic field
AC will induce current
The insulation at the transformer's core is meant for
to avoid sharp edges.
to avoid corrosion.
to avoid electrical contact.
to reduce power loss.
Primary loop is connected to the supply while secondary loop is connected to the load.
True
False
A secondary coil of a transformer has 500 windings. It was supplied with 200 V. How many windings needed at primary coil to produce 100 V.
(a)
Select the correct characteristics for ideal transformers.
Zero leakage flux.
The wire have no resistance.
No hysteresis or eddy currents.
Has similar windings at both primary and secondary coils.
Efficiency of a transformer is
(output current)/(input current) x100%
(output voltage)/(input voltage) x100%
(output loss)/(input loss) x100%
(output power)/(input power) x100%
A transformer has an output power of 500W. It also has core losses and copper loss of 10W. Determine the efficiency (%) of the transformer.
(a)
With respect to the capacitor, which relationship is true? •
C = Q×V
V = C×Q
V = Q/C
Q = C/V
How is the capacitance of a parallel-plate capacitor affected by the distance between the plates ?
C is directly proportional to the area A of each plate
C is inversely proportional to the distance d between the plates
C is partially proportional to the area A of each plate
C is not affected by the area A of each plate
The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x106V/m.
what is the capacitance?
zero
same as potential difference 4.00pF
8.99pF
8pF
8.00x10-9F
The plates of a parallel-plate capacitor are 2.50mm apart, and each carries a charge of magnitude 80.0nC. The plates are in vacuum. The electric field between the plates has a magnitude of 4.00x106V/m.
what is the capacitance?
zero
same as potential difference 4.00pF
8.99pF
8pF
8.00x10-9F
The circuit diagram shows a capacitor that is charged by the battery after the switch is connected to terminal X. The cell has emf V and internal resistance r. After the switch is connected to terminal Y the capacitor discharges through the resistor of resistance R.
What is the nature of the current and magnitude of the initial current in the resistor after the switch is connected to terminal Y?
A
B
C
D
Three identical capacitors are connected in series. The total capacitance of the arrangement is 1/9 mF. The three capacitors are then connected in parallel. What is the capacitance of the parallel arrangement?
1/3 mF
1 mF
3 mF
81 mF
Three identical capacitors, each of capacitance C, are connected as shown.
What is the total capacitance of the combination?
2/3 C
C
3/2 C
3C
A parallel-plate capacitor is connected to a cell of constant emf. The capacitor plates are then moved further apart without disconnecting the cell. What are the changes in the magnitude of the electric field between the plates and in the capacitance of the capacitor?
A
B
C
D
Three capacitors, each one with a capacitance C, are connected such that their combined capacitance is 1.5C. How are they connected?
A
B
C
D
A parallel plate capacitor is connected to a cell of negligible internal resistance.
The energy stored in the capacitor is 4 J and the electric field in between the plates is 100 N C–1. The distance between the plates of the capacitor is doubled. What are the energy stored and the electric field strength?
A
B
C
D
A parallel-plate capacitor is connected to a battery. What happens when a sheet of dielectric material is inserted between the plates without disconnecting the battery?
The capacitance is unchanged.
The charge stored decreases.
The energy stored increases.
The potential difference between the plates decreases.
A fully charged capacitor is connected to a resistor. When the switch is closed the capacitor will discharge through the resistor.
Which graphs correctly show how the charge on the capacitor and the current in the circuit vary with time during the discharging of the capacitor?
A
B
C
D
