Question

Germanium is a semiconducting metal with a resistivity of 0.460 ohm x m. (a) Determine the current per unit area through a 5.00 - V germanium junction with a length of 2.00 mm. (b) Find the current through the junction if its cross - sectional area is 2.00 x 10^-5 m^2.

Answer #1

(a) Resistance is given as where is resistivity, l is the length and A is area.

According to data provided in question, resistance is,

From Ohm' Law, current s given by

(b)

The resistivity of copper is 1.68 x 10-8
W-m. The resistance per unit length (R/L) of a
certain copper cable is 1.61 x 10-5W/m.
(a) What is the cross sectional area of the
cable?
(b) The above cable is used to transmit
electricity from a power station to an electrical substation 42.8
km distant. If the voltage at the substation is 2480 V,
what is the required voltage at the power station when the current
running through the cable is 856 A?...

A tungsten filament with 5.00 mV applied across it has a
current of 1.35 mA and a temperature of 20.0 degrees C. When 5.00 V
are applied across the filament, it has a current of 0.250 A. (a)
What is the temperature of the tungsten filament with 5.00 V across
it? (Tungsten has a resistivity of 5.60 x 10-8 W
m at 20.0 degrees C, and a temperature coefficient of
resistivity of 4.50 x 10-3 degrees
C-1.) (b) If the...

A 10 ohm and a 15-ohm resistor are connected in parallels to a
12 V battery. Find the following:
a. The total resistance.
b. The total current in the circuit.
c. The total power supplied by the battery.
d. Find the resistance of copper wire with a diameter of 4E-3
m and a length of 50 m. The resistivity at 20 0C is 1.68E-8
ohm-m.
e. Two parallel, long wires are separated by 0.50 m. Wire 1
carries a current...

A composite material is made of alternating thin lamellae of
copper (resistivity 1.69 x 10-6 ohm-cm) and a niobium-titanium
alloy (resistivity 7 x 10-5 ohm-cm) of equal thickness. (a) What is
the resistivity of this composite measured parallel to the
lamellae? If current is passed through the composite in this
direction, what fraction of the current will be carried by the
copper? How will the electric fields in the two phases compare? (b)
What is the resistivity of this composite...

1.
A 10.0 m length of wire consists of 5.0 m of copper, followed by
5.0 m of aluminum. Both have a diameter of 1.4 mm. A potential
difference of 95 mV is placed across the composite wire.
*Note* the resistivity of copper is 1.68 x 10
-8 Ohm * m and the resistivity of aluminum is
2.65 x 10 -8 Ohm * m
A. (worth 10 points) What is the equivalent
Resistance of the composite wire?
B. (worth 5 points) What...

A solenoid with a cross-sectional area of 1.14×10-3
m2 is 0.610 m long and has 985 turns per meter. Find the
induced emf in this solenoid if the current in it is increased from
0 to 2.00 A in 33.3 ms. (Answer in V)

Aluminum has a resistivity of 2.65 x10-8 ohm−m. If a
3.0 meter long rectangular aluminum bar, 4.0 cm wide and 5.0 cm
tall is hooked to a 12.0V car battery so that current runs along
its length, how much power is dissipated (until the battery runs
down)?

A
2-wire d.c. distributor, 500 m long is fed at one of its ends. The
cross-sectional area of each conductor is 34 cm^2 and the
resistivity of copper is 1.7x10^-6 Ohm cm. The distributor supplies
200 A at a distance of 300m from the feeding point and 100 A at the
terminus. Calculate the voltage at the feeding end if the voltage
at the terminus is to be 230 V.

Two squares of copper are separated by 6 x 10-6
meters and have a capacitance of 8 nF. (Only air is between the
squares.) A) What is the area of each plate? The plates
are connected to a 120 V power source. B) What is the charge on the
plates? C) What is the potential energy stored in
the capacitor? D) What is the magnitude of the electric field
between the plates? The capacitor is now removed from the 120 V...

A
straight, cylindrical wire lying along the x axis has a length of
0.616 m and a diameter of 0.6 mm. It is made of a material
described by Ohm's law with a resistivity of ρ = 4.72 ✕ 10−8Ω· m.
Assume a potential of 4.85 V is maintained at the left end of the
wire at x = 0. Also assume V = 0 at x = 0.616 m. Find the current
density (in A/m2) in the wire.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 4 minutes ago

asked 12 minutes ago

asked 28 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago