During induction, earthing of the body is done for faster induction. a) True b) False
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During induction, earthing of the body is done for faster induction.
a) True
b) False
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- 5. A search coil consisting of N turns of wire in a circle of radius r is used to measure small magnetic fields. It is to be designed so that flipping it 180 degrees in a field of B=2.0 Gauss causes a total charge of Q = 1x10-7 C to pass through a ballistic galvanometer. (a) Suppose that the coil has a resistance N Ro where Ro is the resistance in one turn of wire. Using the fact that & = -do/dt, show that while the current in the coil depends on the speed with which it is rotated, the total charge Q passing through coil from start to finish does not. (b) If the resistivity of the wire is 8x10-7 m and the diameter of the wire is 100 um, what should be the radius r of the coil? (Neglect the resistance of the galvanometer.) I Gaus. N turns Ballstic Galvenometen (measunee Q)When a magnet is passed through a conducting wire coil, the changing magnetic flux will induce A. an electromagnetic force in the coil. B. a neutral charge on the Faraday Ice Coil. C. a positive charge on the Faraday Ice Pail. D. a negative charge on the Faraday Ice Coil.9. The maximum torque experienced by a coil in a 7.80 × 10-³ T magnetic field is 0.80 N.m. The coil is circular and consists of seven turns. The current in the coil is 8.30 A. What is the length of the wire from which the coil is made? cocci163 16 cci16 ceil cci16 cci16 cc ceil6 cci16
- What is the maximum force on a rod with a 0.100 µC charge that you pass between the poles of a 1.79 T strength permanent magnet at a speed of 3.12 m/s? N2. Two wires carry currents as indicated. I The net torque on the top wire, due to the bottom wire, is: X) a. Directed left e. Directed into the page b. Directed right f. Directed out of the page c. Directed up g. Zero d. Directed down4. The loop in figure is being pushed into the 0.80 T magnetic field at 70 m/s. The resistance of the loop is 0.20 2. What are the direction and the magnitude of the current in the loop? Assume that x = 5.0 cm V • • B ● ● • ● ● • ● ● x ●
- 7. A very long thin wire produces a magnetic field of 0.002 x 10-4 T at a distance of 1.0 mm from the wire. What is the magnitude of the current? = 4 x 10-7 T.m/A) (Mo a) 1.0 mA b) 2.0 mA c) 4000 mA d) 3100 mA 8. An ideal solenoid having 200 turns and carrying a current of 2.0 A is 25 cm long. What is the magnitude of the magnetic field at the center of the solenoid? (но = 4 x 10-7 T.m/A)1. In the diagram below, a wire is varying a current. The magnetic field above the wire is into the paper, and the magnetic field below the wire is out of the paper, as shown. What is the direction of the current flowing in the wire? AL (6) x2 x1 12 By = ik hew, 2