In which of the following situations is there no nett current? 1. A positively charged ion moves to the right 2. A hydrogen atom moves to the right 3. A beam of electrons shoots right 4. In an ionic solution, positive ions flow right, negative ions flow with equal speed to the left
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- If you pick up and shake a piece of metal that has electrons in it free to move as a current, no electrons fall out. Yet if you heat the metal, electrons can be boiled off. Explain both of these facts as they relate to the amount and distribution of energy involved with shaking the object as compared with heating it.10. The mobility of potassium jons in an aqueous velocity (in microns per second) of the stea V/m. Round the answer to integer values. dy-state movement of ions in___7. Given a wire stretching from north to south, electrons are moving south along it. Which ofthe following statements is correct?A. The actual current is directed north; the conventional current is directed south.B. The actual current is directed south; the conventional current is directed north.C. The actual current is directed north; the conventional current is also directed north.D. The actual current is directed south; the conventional current is also directed south.___8. If 3 x 1021 electrons go through the cross section of a wire every minute, what is the currentthrough the wire?A. 0.18 A C. 480 AB. 8 A D. 5 x 1019 A ___9. When the length of the wire is doubled, its resistance is: A. halved C. quarteredB. doubled D. quadrupled ___10. The current through the bulb is 15 mA when connected to a 3-V source. What is theresistance of the bulb?A. 0.045 Ω C. 2 ΩB. 0.20 Ω D. 2000 Ω
- Write T if the statement is correct and if it incorrect write the correct word/s that would make the statement true. a. Conventional current consists of the flow of protons.b. There is only one path for current to flow in a parallelcircuit.c. Conventional current is just a way to indicate currentdirection.What is the difference between conventional current and electron current? What do they have in common?Write True if the statement is correctand if its incorrect write the correct word/s that wouldmake the statement true.a. Conventional current consists of the flow of protons.b. Conventional current is the flow of electrons.c. There is only one path for current to flow in a parallelcircuit.d. Conventional current is just a way to indicate currentdirection.
- Electroconvulsive therapy is a last-line treatment for certain mental disorders. In this treatment, an electric current is passed directly through the brain, inducing seizures. The total charge that passes through the brain is called the dose. In a typical session, a dose of 0.093 C is applied, using a pulse of current that lasts 1.0 ms. What is the current during this pulse?1. Particles with a charge of +3e are incident on a target. If the beam of particles carries a current of 111 µA, how many particles strike the target in a period of 30.0 s? 2. What is the fractional change in the resistance of an iron filament when its temperature changes from 21.4°C to 50.4°C (the 2 questions are not related)With respect to the basic electron theory, what makes a good conductor? What makes a good insulator? Explain the difference and give examples of each.
- Suppose you have a rod of pure silicon with a diameter of 2.79cm and a length of 20.6cm. These rods are often used in experiments, such as the Large Hadron Collider in France/Switzerland to detect high-energy particles, and they have a very high resistivity of 2300Ω⋅m. What current, in amperes, flows through the rod when a potential difference of 1.23* 10^3 V is applied between its ends ?Which of the following carry charge through circuits? A. loosely bound outer electrons B. protons C. Neutrons D. Inner electrons Explain ty1. It is the current that can electrocute a person. Why is it that in a power station we often read "Danger High Voltage", instead of "Danger High Current"? 2. Some electricians can work on "live wires" and touch them without being electrocuted. How did they do it?