We know that charges in a typical wire move very slowly. Explain then why the current is the same all the way around a loop, and how all the charges know to start moving at (virtually) the same instant. [4]
14. 'n Reghoekige geleier word met 'n konstante spoed v getrek deur 'n uniforme en konstante magneetveld B, wat in die bladsy in gerig is in die gearseerde gebied soos aangedui in die figuur.
B (in)
h
R
A rectangular conductor is pulled with a constant speed v through a uniform and constant magnetic field B that is directed into the page in the shaded area as shown in the figure.
i Skryf die algemene uitdrukking vir 'n emk neer, in die vorm van n integraal, en bereken dan die emk vir die opstelling in terme van die gegewe groothede.
Write down a general expression for the emf, in integral form, in terms of the given quantities.
[3]
(ii Bereken die verandering in magnetiese vloed in terme van die gegewe groothede./ Calculate the change in magnetic flux in terms of the given quantities. [3]
15. 'n Geleier met lengte L en hoogte h word met konstante snelheid v deur 'n uniforme magneetveld B beweeg.
B
Skets kwantitatief die verloop van
2L
(i) magnetiese vloed en
i geinduseerde emk 3L as funksie van posisie van die voorkant (regterkant van die lus, vanaf 0 tot 3L soos aangedui in die figuur.
L
2L
A conductor with length L and height h is moved through a uniform magnetic field B with constant velocity v. Show quantitatively the behavior of
i magnetic flux and
(ii) induced emf
as a function of the position of the front (right-hand side of the loop, from 0 to 3L as shown in the figure.
[8]
