QUQSth\" 1 A current of I = 36.1 A flows up the screen through a wire as shown. Consider a point, P, a distance Not complete 6! = 5.08 cm from the wire. Marked out of 1.00 I \\V Flag question Figure 1. A wire and point P is separated with a distance of d. Part 1) What is the direction of the magnetic field at P due to the current carrying wire? Up the screen : Part 2) What is the magnitude of the magnetic field at P due to the current carrying wire? Part3) If a second wire is placed at a distance 5.08 Cm from the first wire with the same current flowing through it in the same direction, what force per metre does the first wire experience due to the current in wire 2? Give a positive answer if it is to the right and a negative answer if it is to the left. I I Wire 1 Wire 2 \fQuestion 2 Not complete Marked out of 100 \\V Flag question A wire fence surrounds a paddock with an area of 12 km2 2 12 X 106 m2. The Earth's magnetic fieid in the region of the paddock is B = 54MT at an angle 60 to the vertical. The Earth's magnetic field is decreasing at a rate of 0.063% per year. (For this problem, we'll assume that the proportional change is uniform in space and constant in time, though this is a poor approximation for the real field ) Part 1) Which of the following statements about magnetic flux are true? 1:] Magnetic flux is independent of the direction between the magnetic field and the surface. C] Magnetic flux is the number of magnetic field lines per unit area passing through a surface. C] Magnetic flux can be thought of as the number of magnetic field lines cutting through a surface. C] Magnetic flux increases in proportion to the magnetic field strength. Part 2) What is the magnetic flux through the paddock clue to the Earth's field, now? em = :l Wb Part 3) When motorists passing through have remembered to shut the gates, the wire fence may be considered as a singleloop electrical circuit. What is the magnitude of the emf induced in the circuit by the Earth's magnetic field? Question 3 Two coils of wire, A and B, are wound around separate iron cores and placed adjacent to each other, as Not complete shown in the below picture. Marked out of COIL A COIL B 1.00 Flag question Ammeter A Battery Figure. Left: Coil A is wound around an iron core and connected to an ammeter. Right: Coil B is wound around an iron core and connected to a battery. Part 1) Coil A is connected to an ammeter, while coil B is connected to a DC battery. Determine the direction of the current through the ammeter: If coil A is moved to the right, towards coil B: (No answer given) Immediately after coil B is disconnected from the battery: (No answer given) If coil B is moved to the left, towards coil A: (No answer given)Part 2) Metal plate Battery A metal plate is placed to the right of coil B, as shown in the diagram above. When viewed from the right of the plate, determine the direction of eddy currents generated in the plate when: The current through coil B is first switched on: (No answer given) s The current through coil B has been flowing for some time: {No answer given) Immediately after the current through coil B is switched off: (No answer given) 3 Part 3) A coil like this could be used to power an induction cooktop. Which of the following statements about induction cooktops are true? C] Pans used on induction cooktops need to have a high resistance, the resistance to eddy currents causes them to get hot. C] Only metal cookware can be used on an induction cooktop. C] Induction cooktops are very efficient, they get very hot. C] An AC current should be sent through the coil if it is used in an induction cookt Question 4 Not complete Marked out of 1,00 \"'7 Flag question Part 1) A circuit is set up in the configuration shown below. 50 +5V Figure 1. Circuit setup. If the voltage supplied by the battery doubled but everything else remained the same, what would be the effect on the voltage drop over each resistor? (No answer given) Part 2) Three charges have Q1 2 4.90 MC: Q2 = 8.48 MC, and Q3 2 12.9 MC. Q] and Q2 are separated by a distance d = 0.914 m, and Q2 and Q3 are also separated by a distance d. Note [,1 2 micro = 106. Q1 Q2 3 d d Figure 2. Charges Q1 and Q2 are separated by a distance d, and Q2 and Q3 are separated by a distance d. What is the net electric force on Q2 due to Q1 and Q3 ? In what direction is this force? Enter a positive number for the magnitude of the force and indicate the direction using the dropdown menu. Part 3) If Q1 and Q3 remain where they are and we move charge Q2 to a point P between Q1 and Q3, where it will experience zero net force, i.e.l how far from Q1 is point P? 1 Q2 3 Clip Figure 3. Charges Q1 and Q2 are separated by a distance dp. The distance between Q1 and Q3 is not changed from Figure 2