Suppose you wish to fabricate a uniform wire from 2.00 g of copper. The wire is to have a resistance of R = 0.580 and all the copper is to be used. (a) What must be the length of this wire? m (b) What must be the diameter of this wire? μm
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- The resistance of wire increases from 40 – ohm at 20 0C to 50 – ohm at 70 0C. Find the temperature coefficient of resistance at 0 0C.Ferromagnetic materials have this characteristic. A. A relative permeability slightly less than one. B. A relative permeability slightly greater than one. C. A very high resistivity. D. A high relative permeability.How temperature effect conductivity? Explain with the help of following equation. m e'n7'
- Please show the exact way to make it in this simplest formsThere is a steel guide bar (According to figure), knowing that its conductivity is 7x106 (ohm - m)-1 . Determine the resistance at 45 ° C and the gauge of a copper wire for its connection.A copper wire has a resistance of 0.85 ohm at 200C. What will be its resistance at 400C ? Temperature coefficient of resistance of copper at 00C is 0.004/0C.
- Problem A potentiometer is an instrument for measuring an unknown voltage in comparison to a standard voltage. In the potentiometer shown in Figure 1.0 a 16.0-m stretch of wire AB is connected to a 9.00-V battery. The resistance per unit length of the wire is 16.0 0/mm. The movable contact P is at point B. An ammeter (circle with A inside) is connected to point A. 16.0 m A B www Figure: 1.0 A V = 9.00 Vthe resistance of copper wire with a=0.00393/C is 183ohms at 46C, its resistance would be aboutThe resistance of a copper wire is 125 ohms at 100°C. Determine the resistance at 70°C
- 1. What is the reluctance of 10 cm diameter silicon steel of 2500 permeability with a mean length of 20 cm? A. 0.000201 cgs B. 0.000102 cgs C. 0.000212 cgs D. 0.000123 cgs 2. At what rate the flux must be varied to measure 12 V across the terminal of 300 turns coil? A. 0.05 Wb/s B. 0.04 Wb/s C. 0.03 Wb/s D 0.02 Wb/sAn aluminium rod with square cross section is 1.3 m long and 3.8 mm on edge ) What is the resistance between its ends? The resistivity of aluminium is 2.75 - 10-8 Q.m. (ii) What must be the diameter of a cylindrical copper rod of length 1.3 m if its resistance is to be the same as that of the aluminium rod? The resistivity of copper is 1.69 * 10-8 Q.m. (iii) Calculate the current (in A) and the current density (in A/m^2) of the cylindrical copper if the potential drop across the ends of the wire is 0.060 V. Select one: a. (i) 3.27 x 10-30 (ii) 15.3 × 10-3 m (iii) l= 18.3 A and J=1 x 105 A/m2 b. (i) 2.50 x 10-3n (i) 3.4 × 10-3 m (iii) l= 24 A and J=2.64 x 10 A/m2 c. (i) 2.50 x 10-3 (ii) 3.4 x 10-3 m (iii) l= 24 A and J=2.08 x 106 A/m2 d. (i) 3.27 x 10-3 (ii) 8.14 x 10-3 m (iii) l= 18.3 A and J=2.64 x 106 A/m210) A certain batch of copper wire was found to have a conductivity of 98% at 20°C. What is its resistivity in un-cm? 11) The resistance of a copper at 30°C is 500. If the temperature coefficient of copper at 0°C is 0.00427. What is the resistance at 100°C?