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WorksheetsAQA PiXL A-Level Physics - Fields
Total questions: 20
Worksheet time: 37mins
A capacitor stores 100 mC of charge for every 0.33 kV of potential difference across its
plates. What is its capacitance?
0.30 mF
300 mF
3300 F
3.3 F
The acceleration of a bare helium nucleus in a uniform electric field of 0.6 V/mm would be:
1.15 x 10-10 m/s2
5.75 x 1010 m/s2
1.15 x 1011 m/s2
2.9 x 1010 m/s2
What is the electrostatic potential energy possessed by an electron 1.00 x 10-10 m from a proton in eV?
-12.7 eV
-3.70 x 10-37 eV
-14.4 eV
-11.4 eV
Determine the approximate maximum EMF generated by an a.c. generator if the magnetic flux through its 20 turn coil is as shown in the flux-time graph shown.
1200 V
120 V
60 V
6000 V
A -12 μC is located at x = 0 cm and a 3 μC charge at x = 4 cm. What is the strength of the electric field at location x = 6 cm, defining the positive x axis as positive?
+2.95 x 105 N/C
0
+3.75 x 107 N/C
-2.95 x 107 N/C
Determine the maximum weight a 20.0 m length of wire could possess in order for it to float in the Earth’s magnetic field per amp of current through it. Assume the Earth’s field is uniform and perfectly horizontal with a magnitude of 50.0 μT.
1.0 N/A
1.0 mN/A
0.1 mN/A
100 mN/A
Three identical capacitors are placed in series. When discharged through a 33 kΩ resistor they lose 95% of their charge in 90 ms. What value is each capacitance?
0.30 μF
2360 nF
0.024 mF
2.73 x 10-6 F
The two wires in the diagram have the currents indicated, both in the same direction, into the page. In the absence of any external magnetic fields they experience a force…
of repulsion from each other, the forces being equal and opposite
of attraction towards one another, the forces being equal and opposite
of repulsion from each other, the force on the 1 A wire being twice that of the 2 A wire
of attraction towards one other, the force on the 2 A wire being twice that of the 2 A wire
A simple circuit of a 12 V battery and 4 capacitors in parallel is made. The capacitors are identical in electrode area and material but the distance between their electrodes is different – this is shown in the data table.
If capacitor C1 has a capacitance of 3600 nF, how much energy is stored by the capacitance combination in the circuit?
0.54 mJ
540 nJ
450 μJ
0.045 mJ
A graph of ln (potential difference across capacitor) on the y-axis against time on the x-axis for the discharging curve of a capacitor, resistor with resistance R and a power supply of voltage V0 as shown would provide you with:
a gradient of 1/RC and an intercept of V0
a gradient of -1/RC and an intercept of V0
a gradient of -RC and an intercept of ln V0
a gradient of -1/RC and an intercept of ln V0
i) Uniform magnetic fields do not change the speed of charged particles within them.
ii) A uniform magnetic field applies no force on a stationary charge.
iii) Uniform electric fields apply a constant acceleration to a charged particle in the direction of the field.
Which of these statements is true?
Only i)
i) and ii)
i) and iii)
All three
What uniform magnetic flux density would need to be present in order to balance the force on a proton travelling at 3.5x106 m/s as it passes through parallel plate electrodes 4 cm apart with a potential difference of 20 kV between them i.e. so that the proton passes through in a straight line?
0.14 T
1.4 mT
7.0 T
7 mT
Different value capacitors in parallel, connected to a power supply, all possess the same…
Current through them
Charge on each one
Potential difference across each one
Electric field in each one
An a.c. generator is altered so that the EMF it produces is changed. It is given twice as many turns, rotated 25% slower, has the coil diameter increased by a factor of 1.25 and improved magnets installed with a field strength 1.5 times stronger than before.
What affect will this have on the EMF generated?
2.81 times higher amplitude, 25% lower frequency
4.69 times higher amplitude, 25% lower frequency
3.52 times higher amplitude, 25% lower frequency
2.81 times higher amplitude, 25% higher frequency
The base SI units for magnetic flux linkage are which of the following?
kgm2s-1C-1
kgms-2A-1
kgm-2s2A-1
kgm2s-2A-1
Uses for capacitors do not include:
Smoothing out dips and spikes in power supplies and a.c. voltages
Emergency power for blackouts (e.g. hospitals)
Camera flashes
Nuclear fusion experiment
An anti-proton is crossing the page from top to bottom. There is a uniform magnetic field coming out of the page towards you. In which direction will the anti-proton initially feel a force?
Directly into the page
To the right
To the left
Directly out of the page
Choose the incorrect ending to the sentence. Transformers…
require an iron core to conduct the electricity from the primary to the secondary.
require that the core be laminated to reduce eddy currents.
require an a.c. input voltage to create a changing magnetic field.
multiply the voltage based on the ratio of the number of turns in the secondary coil to the primary coil.
The a.c. voltage from a household plug is 230 V. the power plant generates electricity at 25 kV and 1000 A, and the current transmitted along transmission lines is 62.5 A.
What must the turns ratio be for the step down transformer from the transmission lines to households. Assume any transformers involved are 100% efficient.
6.8 : 1
1740 : 1
109 : 1
1440 : 1
The graph shown is a mass spectrograph in which the detector position was fixed and the magnetic field strength is varied to change the ion that reaches it.
Only 4 different oxygen isotopes were being studied.
Which one of these represents the ions detected, from left to right?
18O2+ , 16O2+ , 17O3+ , 16O4+
16O4+ , 17O3+ , 16O2+ , 18O2+
16O4+ , 16O2+ , 17O3+, 18O2+
18O2+ , 17O3+ , 16O2+, 16O4+
