EP CONCEPTUAL PHYSICAL SCI.-MOD.MASTER.
6th Edition
ISBN: 9780134091983
Author: Hewitt
Publisher: PEARSON CO
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Chapter 11, Problem 104DQ
Sunlight passing through a pinhole in a piece of paper casts an image of the Sun, as shown. The image size depends on the distance from the pinhole to the floor. If the paper with the pinhole is held about 100 cm above the floor, the diameter of the solar image is about 1 cm. A 1-cm-diamieters coin will just fit over the image (making it easy to measure!). That means about 100 end-to-end coins would fit between the floor and the pinhole. What does this tell you about how many Suns would fit between Earth and the Sun?
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4.) The diagram shows the electric field lines of a positively charged conducting sphere of
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[2]
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3.) The graph shows how current I varies with potential difference V across a component X.
904
80-
70-
60-
50-
I/MA
40-
30-
20-
10-
0+
0
0.5
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VIV
Component X and a cell of negligible internal resistance are placed in a circuit.
A variable resistor R is connected in series with component X. The ammeter reads 20mA.
4.0V
4.0V
Component X and the cell are now placed in a potential divider circuit.
(a) Outline why component X is considered non-ohmic. [1]
(b(i)) Determine the resistance of the variable resistor. [3]
(b(ii)) Calculate the power dissipated in the circuit. [1]
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is moved from Q to P. [1]
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wire P
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wire Q
0.05 m
0.05 m
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(c.ii) Deduce the current in R. [2]
Chapter 11 Solutions
EP CONCEPTUAL PHYSICAL SCI.-MOD.MASTER.
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