(II) A sequence of potential differences V is applied across a wire (diameter = 0.32 mm, length = 11 cm) and the resulting currents I are measured as follows: ( a ) If this wire obeys Ohm’s law, graphing I vs. V will result in a straight-line plot. Explain why this is so and determine the theoretical predictions for the straight line’s slope and y -intercept. ( b ) Plot I vs. V . Based on this plot, can you conclude that the wire obeys Ohm’s law (i.e., did you obtain a straight line with the expected y -intercept)? If so, determine the wire’s resistance R . ( c ) Calculate the wire’s resistivity and use Table 25–1 to identify the solid material from which it is composed.
(II) A sequence of potential differences V is applied across a wire (diameter = 0.32 mm, length = 11 cm) and the resulting currents I are measured as follows: ( a ) If this wire obeys Ohm’s law, graphing I vs. V will result in a straight-line plot. Explain why this is so and determine the theoretical predictions for the straight line’s slope and y -intercept. ( b ) Plot I vs. V . Based on this plot, can you conclude that the wire obeys Ohm’s law (i.e., did you obtain a straight line with the expected y -intercept)? If so, determine the wire’s resistance R . ( c ) Calculate the wire’s resistivity and use Table 25–1 to identify the solid material from which it is composed.
(II) A sequence of potential differences V is applied across a wire (diameter = 0.32 mm, length = 11 cm) and the resulting currents I are measured as follows:
(a) If this wire obeys Ohm’s law, graphing I vs. V will result in a straight-line plot. Explain why this is so and determine the theoretical predictions for the straight line’s slope and y-intercept. (b) Plot I vs. V. Based on this plot, can you conclude that the wire obeys Ohm’s law (i.e., did you obtain a straight line with the expected y-intercept)? If so, determine the wire’s resistance R. (c) Calculate the wire’s resistivity and use Table 25–1 to identify the solid material from which it is composed.
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During an experiment to verify Ohm's law, the voltage supplied and the current through a circuit are measured.
[Voltage is measured in Volt (V) and current in Ampere (A)].
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Battery
The measured value of the current is I = 3.1 ± 0.2 A and that of the voltage is V = 14 0.5 V. The resistance of
the circuit (in N) can be calculated using the formula, R = V/I,
Calculate the,
a) Resistance (in 2) =
b) Fractional uncertainty in the resistance =
c) Absolute uncertainty (in 2) in the resistance=
) An electron beam consist of 1016 electrons passing through a given cross section n one minute. (a) Determine the current in amperes. (b) If the potential difference between the tip of the electron gun and the screen is 5000 V, determine the resistance of the path taken by the electron beam.
In a certain region of space, the current density is ] = C(x³î + y³ĵ + z³k),
being the value of the constant "C" equal to 10-3, the coordinates x, y and
z are in meters.
I)
II)
III)
Find the units of the constant C.
How fast does the charge density "p" (in C/m³.s) change at the
point P with coordinates equal to (2, -1, 4) m?
Find the rate of change of the electric charge contained in a
sphere of radius R=20 cm with center at the origin 0, for a given
instant of time.
Chapter 25 Solutions
Physics for Scientists and Engineers with Modern Physics
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