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Chapter 4: Q72PP (page 1019)
How many turns does this typical MRI magnet have?
(a) 1100; (b) 3000; (c) 4000; (d) 22,000.
This Typical MRI Magnet has 3000 turns.
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Q) A straight, nonconducting plastic wire 8.50 cm long carries a charge density of +175 nC/m distributed uniformly along its length. It is lying on a horizontal tabletop. (a) Find the magnitude and direction of the electric field this wire produces at a point 6.00 cm directly above its midpoint. (b) If the wire is now bent into a circle lying flat on the table, find the magnitude and direction of the electric field it produces at a point 6.00 cm directly above its center.
A very small sphere with positive charge is released from rest at a point from a very long line of uniform linear charge density . What is the kinetic energy of the sphere when it is from the line of charge if the only force on it is the force exerted by the line of charge?
Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. These cyclotrons typically accelerate (the hydride ion, which has one proton and two electrons) to an energy of This ion has a mass very close to that of a proton because the electron mass is negligible about of the proton鈥檚 mass. A typical magnetic field in such cyclotrons is .(a) What is the speed of a ? (b) If the has energy what is the radius of this ion鈥檚 circulator orbit?
Displacement Current in a Dielectric. Suppose that the parallel plates in Fig. 29.23 have an area of 3.00 cm2 and are separated by a 2.50-mm-thick sheet of dielectric that completely fills the volume between the plates. The dielectric has dielectric constant 4.70. (You can ignore fringing effects.) At a certain instant, the potential difference between the plates is 120 V and the conduction current iC equals 6.00 mA. At this instant, what are (a) the charge q on each plate; (b) the rate of change of charge on the plates; (c) the displacement current in the dielectric?
In Europe the standard voltage in homes is 220 V instead of the 120 used in the United States. Therefore a 鈥�100-W鈥� European bulb would be intended for use with a 220-V potential difference (see Problem 25.36). (a) If you bring a 鈥�100-W鈥� European bulb home to the United States, what should be its U.S. power rating? (b) How much current will the 100-W European bulb draw in normal use in the United States?
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