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# chapter26 - d If 100V is used to obtain the same...

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Q1: A cylindrical resistor of radius 5 mm and length 2 cm is made of material that has a resistivity of m x 5 10 5 . 3 . When the energy dissipation rate in the resistor is 1.0 W, what are; a) the current b) the magnitude of the current density c) the potential difference and d) the magnitude of the electric field ? Q2: A heating element is made by maintaining a potential difference of 75 V across the length of a Nichrome wire that has a 2.6 x 10 -6 m 2 cross section. Nichrome has a resistivity of 5x10 -7 m . . If the element dissipates 5000W, a) what is its length?, b) what is the current flowing through the wire?, and c) what is the electric field within the wire?

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Unformatted text preview: d) If 100V is used to obtain the same dissipation rate, what should be the new length? Q3: Three cylindrical resistors X, Y and Z are connected in a circuit as shown in the figure. X and Y have the same length L and cross-sectional area A. The resistor Z has length 2L and cross-sectional area A/2. The resistivity constants of the materials are shown in the figure. Resistors are connected to an ideal battery of 84 V. If the resistance of Y is 6 ; a) Calculate the equivalent resistance of the circuit. b) Find the rate at which electrical energy is dissipated in the resistor X. X Y = 6Ω Z 84 V 2 ρ ρ ρ...
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chapter26 - d If 100V is used to obtain the same...

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