What is the electric field strength 0.10 m from a point charge of +2.0 nC?
From Paper 1: Advanced Physics I
15(a)3 marks
Two parallel plates 5.0 cm apart have a pd of 400 V. Calculate the acceleration of an electron between them.
From Paper 1: Advanced Physics I
15(b)4 marks
A 470 μF capacitor is charged to 12 V and discharged through 10 kΩ. Calculate the charge stored, the energy stored and the time for the pd to halve.
From Paper 1: Advanced Physics I
15(c)4 marks
Explain, using Faraday's and Lenz's laws, how a transformer works and why its core is laminated.
From Paper 1: Advanced Physics I
15(d)3 marks
A 0.12 m wire carrying 4.0 A is at 30° to a uniform field of 0.080 T. Calculate the force on it.
From Paper 3: General and Practical Principles in Physics
3(a)4 marks
Describe how a top-pan balance can be used to determine the magnetic flux density between two magnets.
From Paper 3: General and Practical Principles in Physics
3(b)4 marks
The gradient of a graph of balance reading (g) against current (A) is 2.45 g A⁻¹. The length of wire in the field is 0.050 m. Calculate B and explain why the balance reading can increase.
From Paper 3: General and Practical Principles in Physics
5(c)3 marks
Explain how regenerative braking uses electromagnetic induction to recharge the battery.
From Paper 3: General and Practical Principles in Physics
6(a)4 marks
Sodium-23 ions (charge +e, mass 3.82 × 10⁻²⁶ kg) are accelerated through 1500 V and enter a 0.25 T magnetic field at right angles. Calculate their speed and the radius of their path.
From Paper 3: General and Practical Principles in Physics
6(b)3 marks
Before the magnetic field, ions pass through a velocity selector with crossed electric and magnetic fields. Explain how it works and calculate the electric field needed for these ions if B = 0.25 T.
From Paper 3: General and Practical Principles in Physics
6(c)3 marks
Explain how the spectrometer separates isotopes of the same element.
Score 0 / 36 · 0 of 11 marked
This paper is written by Plasmo in the style of the Edexcel A-Level Physics exam. It is not a past paper and is not produced or endorsed by the exam board.
Electric and magnetic fields Exam Questions: Edexcel A-Level Physics | Plasmo