Question

16. At one point in space the Voltage is measured to be 114 V at a distance of 2 meters away it is measured to be 47 V. Find the magnitude electric field.

Answer #1

Consider a uniform electric field of 20 N/C directed toward the
east. The voltage measured at a point x = 6 m east of the
origin is 80 V. (a What is the voltage measured at a point 5 m
directly south of x? (b What is the voltage measured at a?
c) What is the voltage at the origin?
What is the voltage at the origin?

The voltage measured by a certain antenna is 5V for every V/m of
the incident electric field at 100 MHz. What voltage (dBìV) at the
antenna terminals corresponds to the FCC Class B limit at 100 MHz?
At this antenna voltage, what voltage is measured by a spectrum
analyzer when connected to the antenna by 200 ft of coaxial cable
with 4.5 dB/100 ft of loss at 100 MHz.
[Answer: 57.48 dBìV, 48.48 dBìV]

In contrast to net electric field, when you calculate the
voltage (electrical potential) at a point in space relative to 0 V
(defined as the electric potential halfway between two equal and
opposite charges) – whether it’s due to the presence of one or more
large charges – it is critical for you to include the sign of the
Q’s that are creating the electric field. Why?

In a region of space, there is an electric field. At a
particular point, the electric field is E = (5.0(i-hat) +
12(j-hat)) V/m. A point charge of −300 nC is placed at this
point.
What is the magnitude of the force on the point charge?
What is the x-component and y-component of the force on the
point charge?
What is the direction of the force on the point charge?

In a certain region of space the electric potential is
given by V=+Ax2y−Bxy2, where A =
5.00 V/m3 and B = 8.00 V/m3.
Calculate the magnitude of the electric field at the
point in the region that has cordinates x =
2.20 m, y = 0.400 m, and z =
0
Calculate the direction angle of the electric field at
the point in the region that has cordinates x =
2.20 m, y = 0.400 m, and z =
0.

A point in space has a voltage of 4.5 V. Will a charged particle
accelerate at that location? Explain how you know – or if you don’t
know, explain what additional information would help you determine
the answer.

A 19.0-?F capacitor is connected to an ac generator
with an rms voltage of 114 V and a frequency of 50.0 Hz. Find the
value of the capacitance that should be added to increase the rms
current to 1.00 A.

The surface of a circular disk is charged uniformly. The
magnitude of the electric field produced by the disk on the surface
is measured 3.00×105 N/C at its center.
a.) Find the surface charge density of the disk.
b.) At the point on the central axis perpendicular to the disk,
10.0 cm away from the center of the disk, the magnitude of the
electric field is measured 1.00×105 N/C. Estimate the total charge
of the disk.
c.) Find the magnitude...

The electric potential in a region of space is V=( 260 x2− 160
y2)V, where x and y are in meters. What is the direction of the
electric field at (x,y)=(2.0m,2.0m)? Give the direction as an angle
(in degrees) counterclockwise from the positive x-axis. THe
strenght of the electric field is 1200 V/m.

A proton and an electron are fixed in space with a separation
of 837
nm. Calculate the electric potential at the midpoint between
the two particles.
potential:
V
Find the magnitude of the electric field at the same
point.
magnitude of field:
N/C
The direction of field is
toward the proton.
toward the electron.
another direction.
undetermined.

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