Physics Sec Sample Paper Ii A Worksheet - University Of Malta, 2012 Page 9
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11(c)
The same factory produces magnetic flow meters that measure the rate of flow
of water through a pipe. A small turbine is placed in the pipe so that the water
flow turns the blades and the attached magnets. A solenoid attached to a
galvanometer is placed over the turbine.
to galvanometer
solenoid
turbine
poles of the
water flow
magnet
(i)
Explain how the flow of water induces a current in the solenoid.
_____________________________________________________________________
_____________________________________________________________________
(2)
(ii)
Daniel indicates that the pipes in the magnetic flow meters are usually
made of plastic. Explain why it is not advisable to use steel pipes in
the flow meters.
_____________________________________________________________________
_____________________________________________________________________
(2)
(iii)
Suggest two changes in the setup so that a higher current is caused for
the same water flow.
_____________________________________________________________________
_____________________________________________________________________
(2)
(iv)
Mikela noticed that the water flow (litres/second) is directly
proportional to the current measured by the galvanometer (mA). She
also observed that a water flow of 1.5 litres/s produces a current of
5 mA. Calculate the electrical energy generated in 10 s when water
flowing at a rate of 7.5 litres/second induces a voltage of 2 V.
_____________________________________________________________________
_____________________________________________________________________
_____________________________________________________________________
(3)
Page 9 of 11
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