Question

A wire is made of Tungsten with resistivity of 5.6 x 10-8 (0.m), length of 120 (m) and circular cross section area, also it has a resistance of 300 (0). What is the radius of the wire? BY What is the conductivity of this wire? We connect two ends of this wire to a battery and a current density of 0.002 (A/m”) start flowing in the circuit, what is the voltage of the battery? What is the electric field E magnitude in the wire? EY The resistance of wire is 300 (0) at the temperature of 25 (*C) before connected to the battery, after 2 hours of being connected to the battery, the resistance of wire becomes 327 (0) with temperature of 45 (°C). What is the temperature coefficient of this wire (Tungsten)? F How much power was delivered to this resistor in two hours of working? GF How much heat was generated by the wire in two hours of working?

please do all parts a,b,c,d,e,f and g

Answer 1

Ans. 8 r.m. resistivity , length 120 mi resistance R = we Know A 11 pl R. ld R. 5 6x10 8 cussent Crosse section A R. 6.02 x 107 5-6810 l 350 2 R = fl An cross-section area. A= rr² ro radices of wire. reg? 5.6 x 10 10.8% r 0.7 10 (8) conductivity 1.78x10 current density I I here A El A I = JA I. 0.002% 5.67162 4.48 X 10A voltage V = IR. = 4.48 * x 300 va 1-344 x16 know J= 6 E = E= Jl. E = 0.802 x 5.6x10-8. E = 0.0112 x16 R= Roll+&T) ~Rom resistance at or R= Ro [1 + x (T-To)] To tenperature Ro resitance at T temperature 327= 300 [1 + « [45 - 25)] 1 + 2 (20) 300 327-300 qa Zoox 20 0.0045 Rower . P = VI. = I²R 1-344*10-?x 4.48x105 P = I 2 volts (D.) when a NC E.) Son 327 20 x = 27 300 200 27 a °C 7 - VR. (F.) poti t=zhos= 720osec (9.) Heat = It 7. = 6.02810 x 7200 H = 43.35*104 Joul.