- Electricity and Magnetism^93
Determine the amount of heat Q^2 liberat-ed during this time in the resistor of resist-
ance R2 if the emf of the source is 8, and
its internal resistance can be neglected.
3.48. A jumper of mass m can slide without
friction along parallel horizontal rails sep-
arated by a distance d. The rails are con-
nected to a resistor of resistance R and
placed in a vertically uniform magnetic field
of induction B. The jumper is pushed at a
velocity vc, (Fig. 106).
Determine the distance s covered by the
jumper before it comes to rest. How does
the direction of induction B affect the an-
swer?
3.49. What will be the time dependence of
the reading of a galvanometer connected to
the circuit of a horizontal circular loop
when a charged ball falls along the axis of
the loop?
3.50. A small charged ball suspended on an
inextensible thread of length 1 moves in a
uniform time-independent upward magnet-
ic field of induction B. The mass of the ball
is m, the charge is q, and the period of revo-
lution is T.