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Chapter 28: Q40P (page 831)
A wire m long carries a current of A and makes an angle of with a uniform magnetic field of magnitude T. Calculate the magnetic force on the wire.
The magnetic force on the wire is .
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The coil in Figure carries current i=2.00Ain the direction indicated, is parallel to an xz plane, has 3.00turns and an area of , and lies in a uniform magnetic field (a) What are the orientation energy of the coil in the magnetic field (b)What are the torque (in unit-vector notation) on the coil due to the magnetic field?
The bent wire shown in Figure lies in a uniform magnetic field. Each straight section is 2.0 m long and makes an angle of with the xaxis, and the wire carries a current of 2.0A. (a) What is the net magnetic force on the wire in unit vector notation if the magnetic field is given by T? (b) What is the net magnetic force on the wire in unit vector notation if the magnetic field is given by T?
A wire of length 25.0cm carrying a current of 4.51mAis to be formed into a circular coil and placed in a uniform magnetic fieldof magnitude 5.71mT. If the torque on the coil from the field is maximized. What are (a) the angle between and the coil鈥檚 magnetic dipole moment? (b) the number of turns in the coil? (c) What is the magnitude of that maximum torque?
A circular loop of wire having a radius of 8.0cm carries a current of 0.20A. A vector of unit length and parallel to the dipole momentof the loop is given by . (This unit vector gives the orientation of the magnetic dipole moment vector.) If the loop is located in a uniform magnetic field given by(a)Find the torque on the loop (in unit vector notation)(b)Find the orientation energy of the loop.
Figure 28-35 shows a metallic block, with its faces parallel to coordinate axes. The block is in auniform magnetic field of magnitude 0.020 T. One edge length of the block is 25 cm; the block is not drawn to scale. The block is moved at 3.0 m/s parallel to each axis, in turn, and the resulting potential difference Vthat appears across the block is measured. With the motion parallel to the y-axis, V= 12 mV; with the motion parallel to the z-axis, V= 18 mV; with the motion parallel to the x-axis, V= 0. What are the block lengths (a) dx, (b) dy, and (c) dz?
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