If R. = 8.0 n and the battery voltage Vo = 21.0 V, what is the current in the 2R resistor ?
Two large conducting parallel plates A and B are separated by 2.4 m. A uniform field of 1500 V/m, in the positive x-
direction, is produced by charges on the plates. The center plane at x = 0.00 m is an equipotential surface on which V = 0. An
electron is projected from x = 0.00 m, with an initial velocity of 1.0 X 107 m/s perpendicular to the plates in the positive x-
direction, as shown in the figure. What is the kinetic energy of the electron as it reaches plate A ? (e= = 1.60 X 10-19 C, m e
9.11 x 10-31kg)
E = 1500 V/m
. - -1.2 m
, = + 1.2 m
- = 0.00 m
+2.4 X 10-16 J
-3.3 X 10 -16 J
-2.9 X 10
+3.3 X 10 J
-2.4 x 10-10
A conducting sphere of radius 20.0 cm carries an excess charge of + 15.0 C, and no other charges are
present. The potential (relative to infinity) due to this sphere at a point 12.0 cm
center is closest to
An ideal parallel-plate capacitor consists of a set of two parallel plates of area A separated by a
very small distance d. When this capacitor is connected to a battery that maintains a constant
potential difference between the plates, the energy stored in the capacitor is U.o If the separation
between the plates is doubled, how much energy is stored in the capacitor?
An ideal air-filled parallel-plate capacitor has round plates and carries a fixed amount of equal but
opposite charge on its plates. All the geometric parameters of the capacitor (plate diameter and plate
separation) are now DOUBLED. If the original energy stored in the capacitor was U 0' how much
energy does it now store?
the 4 U.
the U 0/2
What length of a certain metal wire of diameter 0.15 mm is needed for the wire to have a resistance of
15.22 The resistivity of this metal is 1.68 x 10 Q
When a voltage difference is applied to a piece of metal wire, a 3-mA current fows through it If this
metal wire is now replaced with a silver wire having twice the diameter of the original wire, now much
current will flow through the silver wire? The lengths of both wires are the same, and the voltage
difference remains unchanged. (The resistivity of the original metal is 1.68 - 10 o m, and the
resistivity of silver is 1.59 x 10 Q.m.)
How much current will be flowing through a 40.0 m length of cylindrical metal wire with radius 4.0 mm if it
is connected to a source supplying 16.0 V? The resistivity of this metal is 1.68 x 10 Q2 - m.
9.5 x 10 A
A resistor is made out of a long wire having a length L. Each end of the wire is attached to a
terminal of a battery providing a constant voltage Vo. A current I flows through the wire. If
therwire were cut in half, making two wires oflength L/2, and both wires were attached
battery (the end of both wires attached to one terminal, and the other ends attached to the
other terminal), what would be the total current flowing through the two wires?
Two light bulbs, B1 and B2 are connected to a battery having appreciable internal
resistance as shown in the figure. What happens to the brightness of bulb B1 when
we close the switch S ?
The brightness of B1 does not change.
The brightness of B1 decreases temporarily but gradually increases back to its
The brightness of B1 increases temporarily but gradually decreases back to its
The brightness of B1 increases permanently.
The brightness of B1 decreases permanently.
The emf and the internal resistance of a battery are shown in the figure. If a current
of 7.86 A is established through the battery from b to a, what is the terminal voltage
(Vab = Vb-Va) - of the battery?
- 80.0 V
In the circuit shown in the figure, an ideal ohmmeter is connected across ab with the
switch S open. All the connecting leads have negligible resistance. The reading of
the ohmmeter will be closest to
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1. Option 4