10. (a) (i) Draw a labelled diagram to show how Cockcroft and Walton accelerated the protons.
What is the velocity of a proton when it is accelerated from rest through a potential difference of 700 kV?
Write a nuclear equation to represent the disintegration of a lithium nucleus when bombarded with a proton.
Calculate the energy released in this disintegration.
(charge on electron = 1.6022 × 10–19 C; mass of proton = 1.6726 × 10–27 kg; mass of lithium nucleus = 1.1646 × 10–26 kg; mass of helium nucleus = 6.6443 × 10–27 kg; speed of light = 2.9979 × 108 m s–1)
Applied electricity 2009 10. (b) What is electromagnetic induction? Who invented the induction coil?
What is the function of an induction coil?
In an induction coil, a primary coil with a few turns of thick wire and a secondary coil with many turns of thin wire are wrapped on the same soft-iron core.
Why are there a large number of turns in the secondary coil? Explain why the primary coil has thick wire. Why are both coils wrapped on the same soft-iron core?
Radio waves are much less energetic than light waves. List two other types of electromagnetic waves with energy less than that of light waves.
Give one property that is common to all types of electromagnetic waves. Describe, with the aid of a labelled diagram, how a loudspeaker operates.
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10. (b) Describe a laboratory experiment to demonstrate the principle that a current-carrying conductor in a magnetic field experiences a force.
The operation of a moving coil meter is based on this principle. List two other devices based on this principle.
What is the function of a moving coil galvanometer? Draw a circuit diagram to show how a moving coil galvanometer can be converted into an ammeter.
A moving coil galvanometer has a resistance of 100 Ω and a full-scale deflection of 5.00 mA. Calculate the size of the resistor required to convert it into an ammeter with a full-scale deflection of 1.00 A.
What is the effective resistance of the ammeter? Why does the magnet in a moving coil galvanometer have curved pole faces?
