Two wires are made of the same material. If both are at the same
temperature, but...
Two wires are made of the same material. If both are at the same
temperature, but one has twice the diameter and three times the
length of the other, which has the greater resistance, and by what
factor? please explain
Consider two wires made of the same material:
1) If both wires have the same radius, but wire 1 is
half the length of wire 2, what is the resistance of wire 1 in
terms of wire 2?
2) If both wires have the same length, but wire 1 has three
times the radius of wire 2, what is the resistance of wire 1 in
terms of wire 2?
Several wires of varying thickness are all made of the same material and all have the same length. If the wires are arranged in order of decreasing thickness, what can be said about the ordering of their resistance?
A. The wires will be arranged in order of increasing resistance.
B. The wires will be arranged in order of decreasing resistance.
C. The ordering of the resistances can not be determined because the resistivity is not given.
D. The ordering of...
1/ Two strings made of the same material are subjected to the
same tension (therefore the speed of sound will be the same in the
two strings) but have different lengths. The first rope, A, is 80
cm long and the second, B, is 60 cm long. They are vibrated at
various frequencies to produce standing waves.
Consider the first six partials of the two strings and determine
which of the partials of string A will have the same frequency...
company manufactures two products, A and B. Both
products utilise the same material and require skilled labour.
Materials and skilled labour are the only variable costs. Product
details are as follows:
A B
£
£
Selling
price 24 30
Material
costs
5 10
Skilled labour
costs
16 16
Materials cost £5 per kg. Skilled labour costs £8 per
hour. For the month of May 2020 maximum expected demand is for
1,000 units of A and 1,500 units of B. In May 2020...
Two parallel wires are 5.85 cm apart, each with 3.45 A of
current in the same direction.
(a) What is the magnitude of the force per unit length
between the wires?
(b) Is the force attractive or repulsive?
Two long parallel wires carry currents of 2.0 A and 3.0 A in the
same directions.
The wires are separated by 50 cm. At what point between the two
wires the total
magnetic field is zero? Please backup your solution with a
picture!
A compound string is made by fusing together two wires of equal
length and radius, but different materials: A and B. The mass
density of material A is 9 times the mass density of material B.
Under some unknown tension, the compound string is driven at
increasing frequencies. At some unknown frequency, a standing wave
is established with nodes at the ends of the compound string and at
the interface between the two materials.
Given that the tension is constant...
Two
long straight parallel wires are oriented north-south. Both wires
carry constant current due North and are 20cm apart. The current in
one cable is 30A and in the other 40A . a) Determine the magnitude
of the total magnetic field induced by the two cables midway
between them. b) determine the position between the cables where
the total magnetic field induced by the cables is zero. Give your
result as the distance from the 30A cable.
6 parallel copper wires of small but finite radii lie in the
same plane. The wires are separated by equal distance d and they
all carry equal currents in the + z-direction. a. Draw the
corresponding diagram and indicate the direction of the magnetic
field for each wire. b. Find the magnetic field at point P due to
all 6 wires, if P is a distance d to the right of the set of
wires.
Two long parallel wires each carry 2.8 A in the same direction,
with their centers 1.5 cm apart. Part B:Find the magnitude of the
magnetic field at a point in the same plane as the wires, 1.5 cm
from one wire and 3.0 cm from the other. Part C: Find the magnitude
of the force of interaction (per length) between the wires