Aptitude Test Problems in Physics Science for Everyone by S Krotov ( PDFDrive.com )

86 Aptitude Test Problems in Physics

3.33. Can a current passing through a re-

sistor be increased by short-circuiting one

of the current sources, say, the one of emf

-6H 8 E26 1

2

R

Fig. 91

e 2 as shown in Fig. 91? The parameters of

the elements of the circuit should be as-

sumed to be specified.

3.34*. A concealed circuit (black box) consist-

ing of resistors has four terminals (Fig. 92).

If a voltage is applied between clamps

70---/•/////

Fig. 92

1 and (^2) when clamps 3 and 4 are discon-
nected, the power liberated is N 1 = 40 W,
and when the clamps 3 and 4 are connected,
the power liberated is N2 = 80 W. If the
same source is connected to the clamps
3 and 4, the power liberated in the circuit
when the clamps (^1) and 2 are disconnected
is N 3 = 20 W.
Determine the power N4 consumed in
the circuit when the clamps 1 and 2 are