COSMIC PERSP.FUND.-MASTERING ASTRONOMY
3rd Edition
ISBN: 9780134989273
Author: Bennett
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 5QQ
Choose the best answer to each of the following. Explain your reasoning.
Two stars that are in the same constellation (a) must both be part of the same cluster of stars in space. (b) must both have discovered at about the same time. (c) may actually be very far away from each other.
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4.) The diagram shows the electric field lines of a positively charged conducting sphere of
radius R and charge Q.
A
B
Points A and B are located on the same field line.
A proton is placed at A and released from rest. The magnitude of the work done by the electric field in
moving the proton from A to B is 1.7×10-16 J. Point A is at a distance of 5.0×10-2m from the centre of
the sphere. Point B is at a distance of 1.0×10-1 m from the centre of the sphere.
(a) Explain why the electric potential decreases from A to B. [2]
(b) Draw, on the axes, the variation of electric potential V with distance r from the centre of the
sphere.
R
[2]
(c(i)) Calculate the electric potential difference between points A and B. [1]
(c(ii)) Determine the charge Q of the sphere. [2]
(d) The concept of potential is also used in the context of gravitational fields. Suggest why scientists
developed a common terminology to describe different types of fields. [1]
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]
(c(i)) State the range of current that the ammeter can measure as the slider S of the potential divider
is moved from Q to P. [1]
(c(ii)) Describe, by reference to your answer for (c)(i), the advantage of the potential divider
arrangement over the arrangement in (b).
1.) Two long parallel current-carrying wires P and Q are separated by 0.10 m. The current in wire P is 5.0 A.
The magnetic force on a length of 0.50 m of wire P due to the current in wire Q is 2.0 × 10-s N.
(a) State and explain the magnitude of the force on a length of 0.50 m of wire Q due to the current in P. [2]
(b) Calculate the current in wire Q. [2]
(c) Another current-carrying wire R is placed parallel to wires P and Q and halfway between them as shown.
wire P
wire R
wire Q
0.05 m
0.05 m
The net magnetic force on wire Q is now zero.
(c.i) State the direction of the current in R, relative to the current in P.[1]
(c.ii) Deduce the current in R. [2]
Chapter 2 Solutions
COSMIC PERSP.FUND.-MASTERING ASTRONOMY
Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Prob. 2QQCh. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....
Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Choose the best answer to each of the following....Ch. 2 - Prob. 13SEQCh. 2 - Explain all answers clearly, using complete...Ch. 2 - Explain all answers clearly, using complete...Ch. 2 - Explain all answers clearly, using complete...Ch. 2 - Prob. 17SEQCh. 2 - Prob. 18SEQCh. 2 - Explain all answers clearly, using complete...Ch. 2 - Explain all answers clearly, using complete...Ch. 2 - Explain all answers clearly, using complete...Ch. 2 - Explain all answers clearly, using complete...
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