8. A coil lies flat on a horizontal tabletop in a region where the magnetic field points straight down. The magnetic field increases suddenly. When viewed from above, what is the direction of the induced current in this coil as the field increases? A) counterclockwise B) clockwise C) clockwise initially, then counterclockwise before stopping D) There is no induced current in this coil.
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- 8. A coil with an inductance of 1.5 H and a resistance of 10 Nis suddenly connected to an ideal battery with e = 130 v. At 0.12s after the connection is made, what is the rate at which: a. Energy is being stored in the magnetic field. b. Thermal energy is dissipating through the resistor. c. Energy is being delivered by the battery.3. Induced Forces: Two conducting coils are arranged parallel to each other. The first coil is connected to a power supply so that the current is in at the top and out at the bottom. The voltage on the power supply is being decreased. a. What is the direction (left/right/zero) of the magnetic field (due to the first coil) as it goes through the 2nd coil? b. Is the magnetic flux increasing or decreasing? C. What is the direction of the induced magnetic field through the 2nd coil required to resist the change in magnetic flux? f. g. d. What is the direction (in at top/out at bottom or out at top/in at bottom) of the induced current in the 2nd coil required to produce the induced field needed? e. What is true of the magnetic force between the two coils? The coils will attract each other. The coils will repel each other. There is no magnetic force between the coils. What is the direction of the induced current in the 2nd coil if the voltage of the power supply for the first coil is…5) Consider the diagram to the right. If the magnetic field is increasing, there will be an induced magnetic field and a current which runs in the wire. a Out of the page Clockwise b. Out of the page. Counter-clockwise. c. Into the page. Clockwise, d. Into the page. Counter-clockwise •
- 3. Induced Forces: Two conducting coils are arranged parallel to each other. The first coil is connected to a power supply so that the current is in at the top and out at the bottom. The voltage on the power supply is being decreased. a. What is the direction (left/right/zero) of the magnetic field (due to the first coil) as it goes through the 2nd coil? b. Is the magnetic flux increasing or decreasing? c. What is the direction of the induced magnetic field through the 2nd coil required to resist the change in magnetic flux? THK ε d. What is the direction (in at top/out at bottom or out at top/in at bottom) of the induced current in the 2nd coil required to produce the induced field needed? e. What is true of the magnetic force between the two coils? • The coils will attract each other. • The coils will repel each other. • There is no magnetic force between the coils. f. What is the direction of the induced current in the 2nd coil if the voltage of the power supply for the first coil…A single circular loop of wire in the plane of the page is perpendicular to a uniform magnetic field B, directed out of the page as shown above. If the magnitude of the magnetic field is decreasing, then the induced current in the wire is: 28. Figure 5 A. directed upwards out of the paper; B. counter clockwise around the loop; C. anticlockwise round the loop; D. clockwise round the loop.In the picture on the left, a transient clockwise current could be induced in the coil by a. increasing the magnitude of the magnetic field b. none of these c. rotating the coil 90o about an axis that goes through the two hands. d. increasing the area of the coil