7. A conducting loop has an area of 280 cm² and resistance 15 . It is perpendicular to a spatially uniform magnetic field and carries a 350 mA of induced current. At what rate is the magnetic field changing?
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- 20. The image shows a non-constant B-field driving a counter clockwise current in a loop of wire with radius R. For B = et², what is the E-field on the wire at radius R? A. B. C. D. E. tet² R tet² R² tet² R tet2 R² None of the above X X X X X X R X XThe figure below shows a top view of a bar that can slide on two frictionless rails. The resistor is R = 6.2002, and a 2.50-T magnetic field is directed perpendicularly downward, into the page. Let = 1.20 m. xxxxxx x xxxxxx xxxxxx xxxxxx xxx x xxxxxx xxxxxx x x x x x x x xxx app (a) Calculate the applied force required to move the bar to the right at a constant speed of 1.90 m/s. 3.338709 XN (to the right) (b) At what rate is energy delivered to the resistor? 7.679 XW2. Suppose that a rectangular toroid has 2000 windings, h = 1 cm, an inner radius of R1 = 4 cm, and an outer radius of R2 = 6 cm. What is the current flowing through the toroid when the energy in its magnetic field is 2.0 x 10-6 J?
- 2. A slinky is stretched so that there is a gap of 0.95cm between each loop. The magnetic field at the center of the slinky is measured for a range of currents and a graph is plotted of B (in milli-Tesla) versus current I (in Amperes). The result is a straight line with a slope of 0.14 mT/A and an intercept of 0.024 mT. Determine the value of 4 from this result.1. Two solenoids have the same number of turns per unit length, n, and same current i flowing through them. The diameter of coil (a) is twice that of coil (b). If which coil is the magnetic field strength bigger? O A OB A. Coil (a) B. Coil (b) C. The magnetic field is the same in both. D. Not enough information O C ANNAMAANA wwwwwwwwwww. No, that's not the correct answer. (a) X (b)A cylindrical solenoid that is 40-cm long generates a uniform magnetic field of strength 1.4 T inside the solenoid when the current is 7.0 A. How many turns of a single coil are present in this solenoid? a. 40,000 turns b. 64,000 turns c. 56,000 turns d. 48,000 turns e. 32,000 turns
- Two high-current transmission lines carry currents of 45 A and 78 A in the same direction and are suspended parallel to each other 28 cm apart. If the vertical posts supporting these wires divide the lines into straight 16 m segments, what magnetic force does each segment exert on the other? _N. Exponential format with 2 SẺ. QUESTION 14 An induced emf will occur if A. the strength of the magnetic field is changed. B. the coil's area is changed. C. the angle at which the magnetic field and the coil's area meet is changed. D. all of the above.Q. What are the values of (a) L and 5. The secondary coil of a step-up transformer provides the voltage that operates an electrostatic air filter. The turns ratio of the transformer is 50:1. The primary coil is plugged into a standard 120-V outlet. The current in the secondary coil is 1.7 x 103 A. Find the power consumed by the air filter. 6. The earth's magnetic field, like any magnetic field, stores energy. The maximum strength of the1. A flat circular coil with 95 turns, a radius of 4.20 × 10−² m, and a resistance of 0.430 is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate of AB/At = 0.787 T/s. Find the induced current in the coil. A