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Given:
A set of data containing current and voltage through a resistor.
Initially the voltage is and current is
Find:
(a) Value of voltage when current is
(b) Value of current when voltage is
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- How long willit take a charged 80 uF capactor to lose 37%% of its initial energy when it is allowed to discharge through a 45 O resistor? a. 3.58 ms O b. 1.66 ms Oc 1.79 ms O d. 0.51 ms Oe. 0.83 ms Next page Dage Introduction to Phys102> Jump toQ18 A capacitor is connected to batteries by Nichrome wires and allowed to charge completely. Then the plates are suddenly moved farther apart. Describe what happens and explain in detail why it happens, based on fundamental physical principles. If you give a direction for a current, state whether you are describing electron current or conventional current. Include appropriate diagrams to support your explanation.Energiser a. An electric fence, the fence-wire is set to 60 V while the ground is always 0.0 V. If we can think of the bird and the cow as resistors in the circuit. Use what you know from this week and/or last week's lab to explain the response each animal will have. Explain your reasoning. Earth Post b. If you are caught outside in a lightning-storm, it is important to avoid hiding under trees. Many cattle deaths during lightning storms occur when the animals are too close to the tree. It has been frequently seen that a cow standing with its body aligned radially to the tree is less likely to survive than cows that have their body tangentially oriented to concentric circles around the tree. Use what you know from this week and/or last week's lab to explain why cow A is safer than cow B or C. В 25
- True or False 1. Kirchhoff’s Loop Rule is an application of the principle of conservation of energy to the electric potential. 2. Kirchhoff’s Junction Rule states that the total of all the potential rises/ lifts is the same as the total of all the potential drops. 3. An RC circuit is a circuit containing BOTH RESISTORS AND CAPACITORS. 4. When a capacitor is DISCHARGING, the charge on the plates builds up gradually to its equilibrium value of q0 = CV0 where V0 is the voltage of the battery. 5. Ohm times a farad is EQUAL to seconds. 6. When a capacitor is CHARGING, the magnitude q of the charge on the plates at time t is q= q0 [1 - e^(- t/RC) ] 7. The equivalent capacitors stores the same amount of charges but NOT THE SAME amount of energy when connected in PARALLEL. 8. A small time constant means that the capacitor charges and discharges VERY SLOWLY. 9. A good voltmeter is designed with a VERY LARGE resistance for it not to alter the voltage in the circuit when connected. 10. Time…Q1 /A piece of metal is its length 5m and its cross-sectional area 0.5 mm^2 and the specific resistance of the metal is 81.6*10^6 Q– m Note that the density of The substance is 8.96 kg/m^3 and the atomic weight 63.54 calculate: 1) Calculate the motion of the electron (H). 2) Calculate the mean free time (7). 3) If you know that the density of electrons along the x-coordinate increases according to the relationship n = 1030 + 8 * 1033x + 15 * 1036 x2 The temperature is 290k, so what is the value of the diffusion current Id at the metal surface x=0 3) If the value of the propagation current is Id at the distance x From the surface of the metal are 91.2*10^10 A/m2 What is the value of x6. High energy proton beams can be used to kill cancer cells. The beam consists of protons with 2.5x10-" J and a current of 75 nA. Assume all the protons stop in the tumor. A total of 3.4x10-3 J is needed to treat the tumor. A. How fast are the protons moving? B. What is the energy of each proton and the total energy needed in eV? C. How many protons reach the tumor each second? D. How long should the beam run to deliver the required amount of energy to the tumor?
- Raura aloruo. UCF PHY2054 Post Lab-Unit 06 Kirchhoff's Laws -6V + 1. in che picture on the right, what is the current in the wire above the junction? Does charge flenw toward or away from the junction? 10 VThor has two square prism conductors that are made of the same ohmic material and with properties indicated below. Conductor | Length | Cross-Section Side Length Alpha L Beta L/2 8/4 Suppose both conductors are subject to the same potential difference AV across their length while keeping their temperatures fixed. Which of the following is the correct relation between the electric currents, Ia and IB, through Alpha and Beta? A. Ia = 81g B. 8Ia = I8 C. Ia = 4Ig D. 4Ia = I85. A certain Tesla car has a 400 V battery which stores 2.9x108 J. The car can travel 402 km (250 miles) at 105 km/hr (65 mph = 29 m/s) on just the battery before it is depleted. The steps below will let you determine the current delivered by the battery. A. How long does it take to deplete the battery? B. What is the power delivered by the battery (P=E/dt)? C. Power in a circuit is related to the potential difference, current and resistance in the circuit. What is the current delivered by the battery? D. What is the resistance of the circuit?
- 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?mid 9634&page 3 A conductor has a cross-sectional area of 2.3x 10 m and the number of free electrons per unit volume is 8.5x 104 electron/m'. When the current is 10.2 A, find the drift speed (in mm/s) of the electrons. Use the charge of the electron to be 1.6x 10 C. Select one: OA. 0.43 OB. 0.33 OC. 32.61 OD. 0.22 OE. 42.81 page Next page 9:03 P A OD A de ENG 4/30/20 nert 17 V Badapace Nom Sok Y 7 GYH K 4. 15 Enter BYN M 1 Shift End EadFlag 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