A long rigid wire carries a 3.0 A current flowing in the positive Y-direction
Manchester Metropolitan University Physics? Questionnaire
Q1. A long rigid wire carries a 3.0 A current flowing in the positive Y-direction in a device. If a constant magnetic field of magnitude 0.20T is directed along the positive X-axis, then suggest the magnetic force per unit length on the wire. If this wire is replaced by another wire of length 50 cm experience a magnetic field of 1.20T. Evaluate the magnetic force acting on it. Compare both results and conclude the observations. If there is no net charge in a current carrying wire, is it possible to experience a magnetic force by it? Explain your observation.
Q2. A static electric device works at 240 V uses a current of 0.64 A connected to a 20 V,70 W computer identify the static electric machine and evaluate the preferable current used by the computer. If we want to increase the load power to 80W, how much source current is required. Is this device works in dc? Justify.
Q3. A rotating electric machine is used to convert mechanical energy into electrical energy. Consider such a machine with a single turn rectangular coil of 10 cm by 5 cm rotated making an angle of 60° in a horizontal magnetic field of 8000 gauss. Identify the machine and how much rotational force is required for the machine to when a source current of 16 A passing through it. Give recommendations to increase the induced emf produced by it.
Q4. A boy is riding a bicycle with its dynamo on when he increases the speed, the brightness of the bulb connected to the dynamo increases. How can you explain this phenomenon? In such a dynamo, a rectangular wire loop of side 4 cm and 6 cm has 50 turns uniformly from 0.1 T to 0.3 T in 60 ms. Can you suggest the magnitude of induced emf in the coil? How can you increase the induced emf in a circuit? The direction of the induced emf produced due to electromagnetic induction is such that it opposes the change in magnetic flux that produced it. Is this statement true? Justify with your findings.
Q5. For an exhibition project you are designing a circuit of signal processor which can be connected to 230V, 50 Hz supply have a 5.0 H inductor, 80 u F capacitor and 401 resistor kept in series. How can you evaluate the rms current and average power delivered to the circuit? Based on your observation, evaluate the potential drop across capacitance and inductor. Comment about that r m s voltage found in this circuit is less than peak voltage? Justify it with your answer. If you remove the inductor and connect a bulb in series with a capacitor. What will happen to the brightness of bulb if it is connected to DC source and then to an AC source. Assess and find reason for your observations in each case.
Q6. Dealing with two different samples in a thermodynamic experiment, a 1.55 kg sample increases its temperature from 14.5°C to 49.2°C by absorbing 40 kJ of heat energy and second one absorbed 50 kJ of heat energy to change its temperature from 15.8°C to 50.5°C. Compare its specific heat capacities, if they have same mass. Point out which has more specific heat capacity? This sample taken in a closed vessel at 14.5°C under a pressure of 98 mm of Hg. How much pressure (in atm) is required to increase its temperature to 49.2 °C? can you express this result in bar?
Q7. A family leaves for summer vacation by driving on the highway. The car tires start the trip with a pressure of 2.5 atm at a temperature of 20 °C and a volume of 2.1 L. Suggest the preferable pressure of the tire if the volume decreased to 1.4 L after driving, if the temperature of tire gas increases to 108° C. After some time, he stops the car and put some water in the car radiator since it gets heated. Analyze and Justify your answer for usage of water in radiator to cool the system.
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