K.C.S.E Physics Q & A - MODEL 1995PP2QN05
(a) (i) State the law of electromagnetic induction
(ii) Describe an experiment to demonstrate Faraday's law (b) (i) A researcher studying the behaviour of step- up transformer made the following observations: More joules per coulomb and fewer coulombs per second at the output than at the input terminals Explain why the observation does not imply a violation of the principle of conservation of energy (ii) A transformer of 480 turns in the primary coil is used to connect a 9 volt a.c electric device to a 240 v.a.c mains power supply. Calculate the number of turns in the secondary coil.
ANSWERS
​. (a) (i) The magnitude of the induced e.m.f is directly proportional to the rate at which the conductor cuts the magnetic field lines
The induced current flows in such a direction as to oppose the changes producing it. (ii) Plugging a magnetic into a coil
Make power constant VU = Joules current = charge / time Count P = IV For large V, 1 must lower for power input to be equal to power output
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K.C.S.E Physics Q & A - MODEL 1995PP1QN32
A radioactive carbon 14 decay to Nitrogen by beta emission as below
Determine the values of x and y in the equation
K.N.E.C ANSWERS
K.C.S.E Physics Q & A - MODEL 1995PP1QN28
Name the metal used to shields X – rays operators from the radiation. Give a reason why it is used.
K.N.E.C MARKING SCHEME
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