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9: What is the definition of conductivity? A) Current density Electric Field B) Voltage Current C) Current Area D) (Voltage).(Current) E) Electric Field Current density

9: What is the definition of conductivity? A) Current density Electric Field B) Voltage Current C) Current Area D) (Voltage).(Current) E) Electric Field Current density

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Q5: A spherical capacitor is formed from two concentric spherical conducting shells separated by air. Inner sphere has radius a= 5 cm and outer has radius b= 10 cm. What is the capacitance (in pF) of the capacitor? A) 66.7 B) 24.8 9: What is the definition of conductivity? A) Current density Electric Field B) 06: Two identical capacitors C₁ and C₂ have the same charge. Then we insert dielectric material (K 2) between the plates of C₂ only. The ratio U₂/U, of the energies stored in C, and C₂ is: C) 1/2 B) 1/3 A) 3 D) 2 E) 1 3.5 C) 33.3 07: When a wire 5 m long with a diameter of 0.05 mm is connected to a 12 V battery, a current of 4 A flows through it. The resistivity (in 2.m) of the wire material is: A) 5.9 x 10-10 B) 7.9 x 1010 C) 3.5 x 10-¹0 D) 1.2 x 10" E) 2.4 x 10¹ 08: Over a certain region of space, the electric potential is given by V(x) = 1500 x², where x in meter and V in Volt. The electric field (in kV/m) at x = 0.8 m is: A) - 3.9 B) - 2.4i C) - 10.2i D) - 8.1 Voltage Current B) 146.3 D) 41.7 Current Area E) 11.1 C) 117.0 D) (Voltage).(Current) E) A copper wire of radius 2 mm carries a current of 30 A. If Copper has 8.5 x 1028 free electrons/m³, then the drift speed of electrons (in μm/s) is: D) 87.8 E) - 12.3/ Electric Field Current density E) 175.5
Transcribed Image Text:Q5: A spherical capacitor is formed from two concentric spherical conducting shells separated by air. Inner sphere has radius a= 5 cm and outer has radius b= 10 cm. What is the capacitance (in pF) of the capacitor? A) 66.7 B) 24.8 9: What is the definition of conductivity? A) Current density Electric Field B) 06: Two identical capacitors C₁ and C₂ have the same charge. Then we insert dielectric material (K 2) between the plates of C₂ only. The ratio U₂/U, of the energies stored in C, and C₂ is: C) 1/2 B) 1/3 A) 3 D) 2 E) 1 3.5 C) 33.3 07: When a wire 5 m long with a diameter of 0.05 mm is connected to a 12 V battery, a current of 4 A flows through it. The resistivity (in 2.m) of the wire material is: A) 5.9 x 10-10 B) 7.9 x 1010 C) 3.5 x 10-¹0 D) 1.2 x 10" E) 2.4 x 10¹ 08: Over a certain region of space, the electric potential is given by V(x) = 1500 x², where x in meter and V in Volt. The electric field (in kV/m) at x = 0.8 m is: A) - 3.9 B) - 2.4i C) - 10.2i D) - 8.1 Voltage Current B) 146.3 D) 41.7 Current Area E) 11.1 C) 117.0 D) (Voltage).(Current) E) A copper wire of radius 2 mm carries a current of 30 A. If Copper has 8.5 x 1028 free electrons/m³, then the drift speed of electrons (in μm/s) is: D) 87.8 E) - 12.3/ Electric Field Current density E) 175.5
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