The velocity of electrons with current density 1 unit and a charge density of 4000 nC/m3 is Select one: a. None of these O b. 0.25*106 O c. 0.1*106 O d. 0.2*106
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- Solve the following: 1. How many nanocoulomb are there in 3.65 billion electrons ? 2. A 25 ampere electric current flows in a conductor in 75 millisecond. Find: a. current equivalent in mA? b. How many charges are transferred ? c. How much work is required to transfer if 3V is applied. 3. A charge of 3.5 µC present in an electric field produces a force of 0.008 Newton. What is the intensity of the electric field ? 4. A charge of 0.6 µC is placed in an electrostatic field whose intensity is 3 x 105 N/C. How strong is the force acting on the charge ? 5. Two objects are both negatively charge with 0.04 coulomb each and 140 cm apart. What kind of force exist Between charges? How much? 6. Find the force that exist between two charges of 8.53 μC and 4.5 µC that 0.25 meters in air?hw6 A clock battery wears out after moving 8500 C of charge through the clock at a rate of 0.45 mA. How many seconds did the clock run? How many electrons per second flowed through the clock while it was running?Flag question A conductor has a cross-sectional area of 2.3x106 m2 and the number of free electrons per unit volume is 8.5 X1028 electron/m³. When the current is 9.1 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x1019 C. Select one: A. 29.09 B. 38.19 OC. 0.38 D. 0.20 E. 0.29
- Which of the following two statements is true? A or B? _________ A. Most electrons will go into the knob and down to the earth. B. Some electrons will go from the earth through the knob and into the man. 25. Why are shocks worse when you touch conductors rather than insulators? 26. If you take your hat off on a dry winter day. sometimes your hair will stand up. Explain this phenomenon. _______________________________________________________________________________________________24.a. When a standby battery is in storage, at which of the following intervals should the specific gravity ofthe electrolyte be checked?A. 6 monthsB. 1 monthC. 9 monthsD. 3 months24.b. The working voltage of a battery is defined as the voltage at the battery terminalsA. while float charging.B. while the battery is being tested.C. while the battery is being discharged.D. while the battery is being charged.A current of 4A passes through a wire. The number of electrons crossing a point in the wire in 5 minutes is O a. 1.602x10-19 O b. 1.248 x1019 O c. 7.491 x1021 O d. 0 A football player kicks a football with a force of 400 N, north direction. The football hits the foot of the player wi th a force Select one: O a. Less than 400 N, south direction O b. Exactly 400 N, north direction O c. Exactly 400 N, south direction O d. ON
- ok The electric force acting on a proton placed in a downward electric field of magnitude 3x10° N/C is O a 4.8x10 N, upward O b. 5.33x10-26 N, downward Oc. 4.8×10N, downward O d. 5.33x10-26 N, upward A current of SA passes through a wire. The number of electrons crossing a point in the wire in 1 minut a. 3.12x1019The charge passes through a conductor carrying a current I= 2t + 5 (A) in one minute is: Select one: O a. 3900c O b. 125c O c. 7.0c O d. 2.0cQ1. How many electrons per second are necessary to produce 1.0 nA of current? (e = 1.60 × 10-19 C) Q3. A +7.5 nC point charge is 5.0 cm from a -9.4 µC point charge in your laboratory in California. How much work would you have to do if you left the +7.5-nC charge in the lab but took the -9.4 µC charge to New York City? If you then released the +7.5, how much KE would it have once it returned to Cali? 3 parallel + 1 in series – Find Req Q5. How would you reduce Req of a circuit by adding a resistor – numerical piece to follow.
- 1. A. Discuss what electric current is with respect to how you understand drift velocity of moving electric charges. B. In what ways are electron flow and electric current the same? In what ways are these terms different? C. How is drift velocity dependent on current density?Choose the correct answer. Lightning is a visible electrostatic discharged of very high potential ranging from about 100,000 V to 3 Million V in a regular stormy atmosphere to impact potential damage of about 1 Gigajoule of energy. This natural phenomena occurs in order a. to neutralize the charge separation between clouds b. to bridge the gap between two highly ionized but oppositely charged clouds c. for negatively charged cloud particles to seek "ground" level d. any or all of the above theoriescar, what is the current in the car engine? Two point particles with charges +3 µC and +5 µC are held in p each charge in appropriate directions. (a) Draw a free-body diagran Find the distance between the charges. 50 µC and q2 =-25 µC are placed 1.0 m apart. What is the force on a and q2? 3. Point charges qi %3D third charge q3 = 20 µC placed midway between %3D The charges qi = 2.0 x 10 C, q2 =-4.0 x 10 C, and q3=-1.0 x 10 C are placed at the corners of the triangle shown below. What is the force on q1? 4. 5.0 m 3.0 m 4.0m 7.2 The Electric Field If the electric field is 100 N/C at a distance of 50 cm from a point charge q. what is the value of q? 1 The electric tield in a particular thundercloud is 2 10 NC. What is the 2.