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 R R2 None of the above X X X X X X X
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- 11. In the following electromagnet: a. the current in the wires on the side closest to you is directed upwards and the north pole is on the left. b. the current in the wires on the side closest to you is directed downwards and the north pole is on the left. c. the current in the wires on the side closest to you is directed upwards and the north pole is on the right. d. the current in the wires on the side closest to you is directed downwards and the north pole is on the right e. None of the aboveDescribe how the magnetic domains in an unmagnetized iron rod will respond to the presence of a strong external magnetic field. a. The domains will split into monopoles. b. The domains will tend to align with the external field. c. The domains will tend to orient themselves perpendicular to the external field. d. The domains will tend to align so as to cancel out the external field.A small circular coil of 20 loops of wire having a radius of 1 cm is at rest in the X-y plane (so the normal to the loop points in the +z-direction). A uniform magnetic field of 0.5 T is turned on in the +x-direction. What is the magnetic flux through the loop? a. 7.85 x 10 Tm² b. 1.57 x 10 4 T m² O c. 3.14 x 10 3 T m2 O d. 0 T m2
- The diagram below shows two concentric, conducting, circular loops with currents traveling in opposite directions. If the current in the outer loop is I2 = 90.0 μA, what must be the magnitude of the current in the inner loop so that the total magnetic field at the center, C, of both loops is zero? a. 60.0 μA b. 45.0 μA c. 90.0 μA d. 75.0 μA e. 105 μAThe diagram below shows two, thin, infinitely-long, parallel conducting wires that are separated by a perpendicular distance of 2.0 cm. What is the coordinate on the y-axis where the total magnetic field is zero? a. y = 4.8 cm b. y = 5.6 cm c. y = 4.4 cm d. y = 6.6 cm e. y = 5.2 cmMagnetic Forces Problem 19: Suppose a 2.2 T field is applied across a 10-gauge copper wire (2.588 mm in diameter) carrying a 18 A current. What would the Hall voltage be, in microvolts, if the number density of free electrons in copper is 8.34 × 1028m-3.
- 1. A wire runs from north to south a. A compass needle placed above the wire points with its north pole toward the east. In what direction is the current flowing? b. If a compass is placed underneath the wire, in which direction will its needle point? 2. What will be the direction of the magnetic field if the current is due upward? 3. How does the magnitude of the current passing through the conductor affect the magnetic field?If you cut this magnet in half as indicated, which of the following two halves do you expect to get? A. S N N S В. | N S S N С. | S N S N D. N Е. Unmagnetized A B EThe net magnetic flux through a closed surface.... a. depends on the net current threading through the surface. b. depends on the net charge enclosed by the surface. c. is always zero. d. is always a positive value.