Show that the radius of a geostationary orbit is about 4.2 × 10⁷ m. (Mass of Earth = 5.97 × 10²⁴ kg)
From Paper 2
2(b)3 marks
Calculate the minimum energy needed to move a 1200 kg satellite from the Earth's surface (radius 6.37 × 10⁶ m) to geostationary orbit, ignoring its kinetic energy.
From Paper 2
2(c)2 marks
Explain why a satellite in a lower orbit moves faster.
From Paper 2
3(a)3 marks
Compare gravitational and electric fields, giving one similarity and two differences.
From Paper 2
3(b)5 marks
A 220 μF capacitor charged to 9.0 V is discharged through a 47 kΩ resistor. Calculate the time constant, the pd after 15 s and the energy transferred in that time.
From Paper 2
3(c)2 marks
Explain why inserting a dielectric between the plates increases the capacitance.
From Paper 2
4(a)4 marks
Electrons accelerated through 2000 V enter a uniform 1.5 mT magnetic field at right angles. Calculate their speed and the radius of their path.
From Paper 2
4(b)4 marks
A coil of 200 turns and area 4.0 × 10⁻³ m² rotates at 50 Hz in a uniform field of 0.050 T. Calculate the peak and rms emf.
From Paper 2
4(c)3 marks
Explain why a magnet falls slowly through a vertical copper tube.
From Paper 2
111 mark
At a height equal to the Earth's radius above the surface, the gravitational field strength is:
From Paper 2
121 mark
The period of a geostationary satellite is:
From Paper 2
131 mark
Which is the escape velocity from a planet of mass M and radius r?
From Paper 2
141 mark
Gravitational potential near a planet is:
From Paper 2
151 mark
The distance between two point charges is doubled. The force becomes:
From Paper 2
161 mark
What is the field strength between plates 2.0 cm apart with pd 500 V?
From Paper 2
171 mark
What charge is stored on 470 μF at 6.0 V?
From Paper 2
181 mark
What energy is stored in 100 μF at 12 V?
From Paper 2
191 mark
What is the time constant of 10 kΩ and 220 μF?
From Paper 2
201 mark
After one time constant, what fraction of the initial charge remains?
From Paper 2
211 mark
What is the force on a 0.050 m wire carrying 3.0 A at right angles to a 0.20 T field?
From Paper 2
221 mark
A charged particle moves in a circle in a magnetic field. If its speed doubles, the radius:
From Paper 2
231 mark
The flux linkage of a coil changes by 0.12 Wb-turns in 0.040 s. What is the average induced emf?
From Paper 2
241 mark
An ideal transformer has 1200 primary turns and 60 secondary turns. The primary voltage is 240 V. The secondary voltage is:
From Paper 3 (Section A + Option A: Astrophysics)
4(a)3 marks
Describe how to investigate the discharge of a capacitor through a resistor.
From Paper 3 (Section A + Option A: Astrophysics)
4(b)4 marks
A graph of ln(V / V) against t is a straight line of gradient −0.0435 s⁻¹. The resistor is 100 kΩ. Calculate the capacitance.
Score 0 / 51 · 0 of 25 marked
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Fields and their consequences Exam Questions: AQA A-Level Physics | Plasmo