(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.
) 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.
(a) When measuring the voltage across a resistor and the current through it, the voltmeter and the
ammeter should be connected in
respectively, to the resistor.
series and series
series and parallel
O parallel and series
O parallel and parallel
(b) The resistances of an ideal voltmeter and ammeter should be
infinity and zero
infinity and infinity
zero and infinity
zero and zero
respectively.
Hint: Voltage is the measure of difference of the potential between two different points. Current is
the measure of the flow of electrons.
(e) In electrical circuits, Ohm's law can be mathematically modeled as I = V/R,
whereas I is the current through the resistor, V is the voltage across the resistor,
and R is the resistance of the resistor. A temperature-dependent resistor that has a
resistance, R(T) = 107², was used in this specific circuit. Assuming a constant
voltage of 10V, determine l's rate of change with time (in Amperes per minute) at
25°C if the temperature is increasing at a constant rate of 5 Kelvin per minute. Ans:
-0.4 A/min
Chapter 25 Solutions
Physics for Scientists and Engineers with Modern Physics
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