Q12 q > 0, so F is in the direction of v B
(a) v B is -. |F| = q v B sin = qvB. F = - qvB
(b) v B is +. |F| = q v B sin = qvB. F = qvB
(c) v B is 0.
(d) v B is -. |F| = q v B sin = qvB sin45. F = - qvB/ 2
(e) v B is at 45 between the - and - direction.
Q10 Ampere's Law is the right one to use when there is a great deal of symmetry, making the circulation integral fairly easy and resulting in a simple expression in which B, the field at the desired location, appears. We can solve it for B without having
Q 1 The force is the interaction between the magnets field and the eddy currents induced in the plate via
electromagnetic induction. See Fig. 29-19b, where its clear that there is a retarding force exerted on the moving
plate/disk. The induced emf is prop
Q3 Coil 1 would afterward be unable to produce any flux through Coil 2, so it could never change. M = 0.
dI
Q13 dt = inductor = . Well, it wont be infinite, but as large as necessary to get the job done (of
sending the inductors formerly stored energy els