1) wires I and I are made of the same metal. wire 2 has twice the length and twice the diameter of wire 1. What are the ratios (a) Q2/Q² of the resistivities and (b) 12.2/121 of the resistance of the two wires? A) P₁/P₁ = 1, 1²₂/1²₁=0.5 13) P₂/p₁ = 1, 12₂/12₁ =0.25 () P₂/P₁ = 0.5³ h₂/1²₁=0.5 D) P₁/P₁ = 0.25, 1₂₁/1²₁ = 0.5

In the circuit shown in the diagram below, two thick wires connect a 1.5 volt battery to a Nichrome (NiCr) wire. Each thick connecting wire is 17 cm long, and has a radius of 9 mm. The thick wires are made of copper, which has 8.36e+28 mobile electrons per cubic meter, and an electron mobility of 0.00434 (m/s)/(V/m). The Nichrome wire is 8 cm long, and has a radius of 4 mm. Nichrome has 9e+28 mobile electrons per cubic meter, and an electron mobility of 7e-05 (m/s)/(V/m). What is the magnitude of the electric field in the thick copper wire? V/m What is the magnitude of the electric field in the thin Nichrome wire? V/m Copper Copper Nichrome

An uncharged capacitor with C = 39 μF and a resistor with R = 75 Ω are connected in series with a battery of ε = 7.5 V. a) Calculate the numerical value of τ in μs.  b) Calculate the numerical value of Q in μC.

7 The wires in figure are all made of the same material. 2L 4L ,,L 2L L 2r 2r 0 2r 0 A B C D E Rank in order, from largest to smallest, the resistances RA to RE of these wires. Rank from largest to smallest. To rank items as equivalent, overlap them. Reset Help RE RB RD RA Rc Smallest Largest The correct ranking cannot be determined.

The circuit of the figure shows a capacitor, two ideal batteries, two resistors, and a switch S. Initially S has been open for a long time. If it is then closed for a long time, what is the change in the charge on the capacitor? Assume C = 34 µF, 8₁ = 3.1 V, 82 = 5.9 V, R₁ = 0.39 02, and R₂ = 0.610. Number i R₁ S с R₂ Units uC

Three resistors R₁ R₁ E₁ 86.22, R₂ = 22.1 , R3 = 70.00, and two batteries &₁ = 40.0 V, and E2 = 354 V are connected as shown in the diagram below. ww R₂ A A A 39 (a) What current flows through R₁, R₂, and R3? I₁ = I₂ = I3 = R3 (b) What is the absolute value of the potential difference across R₁, R₂, and R3? |AVR1|=| V |AVR2| = V |AVR3|=|

3 9. Four resistors R₁=7.00 2, R₂ =11.0 2, R3-10.0 2, and R4 8.00 2 are mounted as shown in the figure. The voltage of the battery is V = 22 Volts. What is the current in the R₂ resistor? X 0.16 Amps 32,444 20 $ 888 F4 24 % 5 2 6 tv F6 -www- R₁ H MacBook Air & 7 www R₂ e AA F7 * 00 8 DII FB R3 R4 9 F9 F10 (1 F11 F12

A copper wire has a resistance of 0.49 Ω at 20.0°C, and an iron wire has a resistance of 0.57 Ω at the same temperature.  a) At what temperature, in degrees Celsius, are their resistances equal? The temperature coefficient of copper is 3.9 * 10^-3 (degrees Celsius)^-1, while that for iron is 5.0 * 10^-3 (degrees Celsius)^-1.

= 8. Find the current in the R₁ resistor in the drawing (V₂ = 16.0 V, V3 S). ssfox's f60 A 0 ss160 ssf60 ss160 ss160 W 500 f60 ssf60 ssf60 ssf60 ssf60 ssin ssf60 ssfoo www R3 ww R₂ V3 ssf60 st sf60 1.702, R₂ 2.00 , and R3 18.0 V, R₁ = *J$$:09J$$ (9J$/ 091797 = 2.20 ssf60 ssf60 ssf60 0 ssf60 ssf60 ssf60 ssf60 ssf60

If gold (PAu = 2.44 x 10-8 N. m) and silver (PAg = 1.59 × 10-8 n. m) wires of equal length are found to have the same resistance. 4 a) Find the ratio of their radii (rAL/r Cu)? b) Which element (Au or silver) is better for conducting electrical current? Explain. LEGO