A potential difference of 12 V is found to produce a current of 0.35 A in a 3.3 m length of wire with a uniform radius of 0.45 cm. Find the following values for the wire. (a) the resistance (in Q) (b) the resistivity (in 2. m) Ω.m
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- A potential difference of 11 V is found to produce a current of 0.40 A in a 3.3 m length of wire with a uniform radius of 0.40 cm. Find the following values for the wire. (a) the resistance (in Ω) (b)the resistivity (in Ω · m)A potential difference of 12 V is found to produce a current of 0.41 A in a 3.5 m length of wire with a uniform radius of 0.36 cm. Find the following values for the wire. (a) the resistance (in (2) Ω (b) the resistivity (in 2 m) Ω · m 4A potential difference of 11 V is found to produce a current of 0.42 A in a 2.8 m length of wire with a uniform radius of 0.42 cm. Find the following values for the wire. (a) the resistance (in Ω) Ω (b) the resistivity (in Ω · m) Ω · m
- A cylindrical conductor has resistance of R0 = 140 Ω. It has length L, radius of the cross section r, and resistivity ρ. Part (a) Express the resistance in terms of L, r, ρ. Part (b) If the resistivity increases by a factor of 5, what would the value of the new resistance be, in ohms? Part (c) If the resistivity was restored to its original value and instead the length of the conductor decreased by a factor of 5, what would the value of the new resistance be, in ohms? Part (d) If the resistivity and length of the conductor were at their original values and the radius of the conductor increased by a factor of 4, what would be the value of the new resistance, in ohms?Two identical resistors of R0=32 omega are connected head to tail. Part (a) Express the resistance R0 of one of the resistors in terms of the resistivity, length L, and the cross section area A. Part (b) calculate the total resistance R of the two resistors in ohms.Two identical resistors of R0 = 98 Ω are connected head-to-tail. Express the resistance R0 of one of the resistors in terms of the resistivity ρ, length L, and the cross section area A. Calculate the total resistance R of the two resistors in ohms.
- Two identical resistors of R0 = 71 Ω are connected head-to-tail. (a) Express the resistance R0 of one of the resistors in terms of the resistivity ρ, length L, and the cross section area A. (b) Calculate the total resistance R of the two resistors in ohms.A potential difference of 10 V is found to produce a current of 0.39 A in a 2.6 m length of wire with a uniform radius of 0.40 cm. Find the following values for the wire. (a) the resistance (in Q) (b) the resistivity (in 2· m) Q: mA potential difference of 11 V is found to produce a current of 0.40 A in a 3.3 m length of wire with a uniform radius of 0.43 cm. Find the following values for the wire: (a) the resistance Ω(b) the resistivity Ω · m
- A cylindrical conductor with resistivity ρ, length L, and radius r , has resistance R0=302Ω. If the resistivity and the length of the conductor both have their original values, but instead the radius of the conductor is increased by a factor of 5, what is the new value, in ohms, of the resistance?As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a iron rod has a resistance of 2.78 Ω at 20.0°C, determine the resistance of the rod (in Ω) at 120°C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for iron is 4.50 ✕ 10−6 (°C)−1 and the temperature coefficient of resistivity is 4.50 ✕ 10−3 (°C)−1. ΩA cylindrical resistor of radius 5.0 mm and length 2.0 cm is made of material that has a resistivity of 3.5 * 10-5 ohm m.What are (a) the magnitude of the current density and (b) the potential difference when the energy dissipation rate in the resistor is 1.0W?
