Q: Refer to Prob. 7.11 (and use the result
Refer to Prob. 7.11 (and use the result of Prob. 5.42): How long does is take a falling circular ring (radius a, mass m, resistance R) to cross the bottom of the magnetic field B, at its (changing) ter...
See AnswerQ: (a) Referring to Prob. 5.52(a
(a) Referring to Prob. 5.52(a) and Eq. 7.18, show that for Faraday-induced electric fields. Check this result by taking the divergence and curl of both sides. (b) A spherical shell of radius R carries...
See AnswerQ: A battery of emf ε and internal resistance r is hooked up
A battery of emf ε and internal resistance r is hooked up to a variable “load” resistance, R. If you want to deliver the maximum possible power to the load, what resistance R should you choose? (You c...
See AnswerQ: Electrons undergoing cyclotron motion can be sped up by increasing the magnetic
Electrons undergoing cyclotron motion can be sped up by increasing the magnetic field; the accompanying electric field will impart tangential acceleration. This is the principle of the betatron. One w...
See AnswerQ: An infinite wire carrying a constant current / direction
An infinite wire carrying a constant current / direction is moving in the y direction at a constant speed v. Find the electric field, in the quasistatic approximation, at the instant the wire coincid...
See AnswerQ: An atomic electron (charge q) circles about the nucleus (
An atomic electron (charge q) circles about the nucleus (charge Q) in an orbit of radius r ; the centripetal acceleration is provided, of course, by the Coulomb attraction of opposite charges. Now a s...
See AnswerQ: The current in a long solenoid is increasing linearly with time,
The current in a long solenoid is increasing linearly with time, so the flux is proportional to t : Ф =αt . Two voltmeters are connected to diametrically oppos...
See AnswerQ: A circular wire loop (radius r , resistance R) encloses
A circular wire loop (radius r , resistance R) encloses a region of uniform magnetic ï¬eld, B, perpendicular to its plane. The ï¬eld (occupying the shaded region in Fig....
See AnswerQ: In the discussion of motional emf (Sect. 7.1
In the discussion of motional emf (Sect. 7.1.3) I assumed that the wire loop (Fig. 7.10) has a resistance R; the current generated is then I= v Bh/R. But what if the wire is made out of perfectly cond...
See AnswerQ: (a) Use the Neumann formula (Eq. 7.
(a) Use the Neumann formula (Eq. 7.23) to calculate the mutual inductance of the conï¬guration in Fig. 7.37, assuming a is very small /Compare your answer to Prob. 7.22. (b) For the gen...
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