A student is asked to compare the e.m.f.s of a standard cell and a test cell. He
Question:
A student is asked to compare the e.m.f.s of a standard cell and a test cell. He sets up the circuit shown using the test cell.
Figure 11.15
a i. Explain why he is unable to find a balance point and state the change he must make in order to achieve balance.
ii. State how he would recognise the balance point.
b. He achieves balance when the distance AB is 22.5 cm. He repeats the experiment with a standard cell of e.m.f. of 1.434 V. The balance point using this cell is at 34.6cm. Calculate the e.m.f. of the test cell.
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a i The student is unable to find a balance point because the circuit is not complete The circuit requires a closed loop for the current to flow and f...View the full answer
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Related Book For 
Cambridge International AS And A Level Physics Coursebook
ISBN: 9781108859035
3rd Edition
Authors: David Sang, Graham Jones, Gurinder Chadha, Richard Woodside
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