What is the value of current if a 50C charge flows in a conductor over a period of 5 seconds? a) 5A b) 10A c) 15A d) 20A
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What is the value of current if a 50C charge flows in a conductor over a period of 5 seconds?
a) 5A
b) 10A
c) 15A
d) 20A
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- What is a proton? Where does it normally exist in an atom, and what is its charge?13. Name two factors that determine the speed an electron attains inside a gas environment.Current can not flow through an insulator because they have O a. free electrons O b. no free protons O c. no free electrons O d. free neutrons
- Suppose that the current entering the positive terminal of an element is 4A. The total charge entering the terminal between t=0 and t= 3 seconds is: 1.33 C .b. 12 C None of the above O d. 0.75 C O..0.0 Cb. A piece of pencil lead is connected in series with an ammeter and a power supply. The power supply is turned on. After a few minutes, although the potential difference across the pencil lead does not change, the current in the circuit increases significantly. Explain why the current increases. c. Electric fields are caused by both point charges and by parallel plates with a potential difference across them. Describe the difference between the electric field caused by a point charge and the electric field between parallel plates. Your answer should include a diagram of each type of field and reference to electric field strength. Question 2A charge of 2 mC flows through a cross section 2.5 mm2 normally in 2 seconds. The current is ?
- (b) Figure 2 shows a plastic rod with a uniform charge -Q. It is bent in a 120° circular arc of radius r and symmetrically aced across an x-axis with the origin at the centre of curvature Pof the rod. Show that electric field, E at point P is given by 0.83Q E = 4T Egr2Calculate the current and voltages of resistance and inductance with an electrical circuit diagramQuestion 3 a. Some materials exhibit the property of superconductivity under certain conditions. State what is meant by superconductivity and explain the required conditions for the material to become superconducting. b. The diagram below shows the cross-section of a cable consisting of parallel filaments that can be made superconducting, embedded in a cylinder of copper. copper cylinder filament The cross-sectional area of the copper in the cable is 2.28 x 10-7 m². The resistance of the copper in a 1.0 m length of the cable is 0.075 N. Calculate the resistivity of the copper, stating an appropriate unit. State and explain the what happen to the resistance of the cable when the embedded filaments of wire are made superconductive? i.
- 2 Curront is definad as the rate of charge flow. It a charge offo.0065 Golombs passes a given point in a conductor in loo millisesands, Calcutate the? a) current in amperes (Hint: I=) b) Current in milli ampares- a.given Ans: a)o.065 A b) 65 mAIf the current flowing in a certain conductor is 40 mA.a. find the total charge in coulomb andb. find the total number of electrons that passes through the conductor in 1.8s. (e=1.602x10-19C/electrons)Which of the following are a pair of equal and oppositely charged particles? A) protons and neutrons B) protons and electrons C) electrons and neutrons D) neutrons and atoms
