Irodov – Problems in General Physics

R 0 , and voltage Vo is applied to its terminals. Find the voltage V
fed to the device as a function of distance x. Analyse separately the
case R >> R 0.

0

R o

1

618 R^ z

Fig. 3.42. Fig. 3.43.

3.180. Find the emf and the internal resistance of a source which
is equivalent to two batteries connected in parallel whose emf's
are equal to ei and 6 2 and internal resistances to R 1 and R2.
3.181. Find the magnitude and direction of the current flowing
through the resistance R in the circuit shown in Fig. 3.44 if the

A

1_. 1 7

82 '03

Rs

. 182
.B
Fig.3.45.
Fig. 3.44.

emf's of the sources are equal to gi = 1.5 V and t, = 3.7 V and
the resistances are equal to R 1 = 10 S2, R2 = 20 S2, R = 5.0 Q.
The internal resistances of the sources are negligible.
3.182. In the circuit shown in Fig. 3.45 the sources have emf's
ti = 1.5 V, g, = 2.0 V, g 3 = 2.5 V, and the resistances are
equal to R 1 = 10 S2, R 2 = 20 S2, R, = 30 Q. The internal resistances
of the sources are negligible. Find:

(a) the current flowing through the (^82)
resistance R 1 ; i 1
(b) a potential difference TA — cps (^) I I
between the points A and B.
3.183. Find the current flowing through 6° 1 T 8 T^6
the resistance R in the circuit shown in
Fig. 3.46. The internal resistances of the Fig. 3.46.
batteries are negligible.
3.184. Find a potential difference CpA — cp B between the plates
of a capacitor C in the circuit shown in Fig. 3.47 if the sources have
emf's F, = 4.0 V and E, = 1.0 V and the resistances are equal
to R, = 10 Q, R2 = 20 Q, and R3 = 30 Q. The internal resistances
of the sources are negligible.