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- 1. Multiple Choice
A flat coil consists of 20 turns each of area
an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ohms , what is the magnitude of the induced current?
70 mA
140 mA
500 mA
800 mA
- 2. Multiple Choice
A circular conducting loop is in a region of magnetic field B directed out of the page, as shown below. The magnitude of the magnetic field is decreasing. The direction of the induced current in the loop is
Clockwise
counterclockwise
Undefined because the current is zero
Impossible to determine without knowing the rate of change of field
- 3. Multiple Choice
The figure shows a bar magnet moving vertically upward toward a horizontal coil. The poles of the bar magnets are labeled X and Y. As the bar magnet approaches the coil it induces an electric current in the direction indicated on the figure (counter- clockwise as viewed from above). What are the correct polarities of the magnet?
X is a north pole,Y is a south pole
X is a south pole,Y is a north pole
Both X and Y are north poles
Both X and Y are south poles
- 4. Multiple Choice
A conducting ring is moving from left to right through a region that contains a constant magnetic field as shown in the diagram. In which region is there an induced current in the ring?
A and E
B and D
B,C and D
A,B,C and D
- 5. Multiple Choice
A uniform 4.5 T magnetic field passes perpendicularly through the plane of wire loop 0.10 m2 in area. What flux passes through the loop?
5.00 Tm2
0.450 Tm2
0.250 Tm2
0.135 Tm2
- 6. Multiple Choice
A coil in a magnetic field encloses a flux of 0.256 Tm2 when the angle between the normal to the coil and the direction of the magnetic field is 70.0°. What flux would go through the coil if the angle were changed to 40.0°?
0.332 T·m2
0.198 T·m2
0.114 T·m2
0.573 T·m2
- 7. Multiple ChoiceWhat is the direction of the induced magnetic field?LeftRightUpDown
- 8. Multiple ChoiceWhat is the direction of the induced magnetic field?LeftRightUpDown
- 9. Multiple ChoiceIn what direction is the magnet moving?LeftRightUpDown
- 10. Multiple Choice
Which side of the coil above will be north?
Right side
Left side
- 11. Multiple Choice
Which direction will the force act on the current shown above?
Into the page
Out of the page
Up the page
Down the page
- Answer choicesTagsAnswer choicesTags