Question

Choose true or false.

True False Two straight wires carry electric currents in the
positive directions along the *x*- and *y*-axes. In
the first quadrant, the magnetic field is directed out of the plane
of the paper in some places, into the plane of the paper in other
places, and in some places it is zero.

True False A parallel-plate capacitor has a
capacitance of 10 *mF* and is charged with a 20 *V*
power supply. The power supply is then removed and a dielectric of
dielectric constant 4 is used to fill the space between the plates.
The voltage now across the capacitor is 5 *V*.

True False An atom of oxygen that has been doubly
ionized is sent through a uniform magnetic field in a direction
perpendicular to the field. The period of revolution of the ion is
*T*. The ion picks up an electron, becoming singly ionized,
this action having a negligible effect on the speed of the ion. The
period of revolution of the ion is now 4*T*.

True False A circular loop of wire of radius *R*
carries a current *I*. The loop lies in the
*xy*-plane with its center at the origin. The direction of
the magnetic field at the center of the loop must be in the
direction of the negative *z*-axis.

True False A 6-ohm resistor, an 8-ohm resistor, and a
24-ohm resistor are connected together. The minimum resistance that
can be produced, using all three resistors is 4-ohms.

Answer #1

1. True

If the current in the two wires are equal then magnetic field will be zero. If current in two wires are different then magnetic field will be either in plane or out of the plane.

2. True

Capacitance becomes 4 fold on inserting dielectric. Since Q = C V. Thus voltage decrease by 4 times. Thus V = 5 volt.

3. False

On picking the charge speed drops by a factor of 2. Therfore time period will increase by a factor of 2.

4. False

It depends on the direction of current flowing in the loop. If current flows in counterclockwise then magnetic field will be in z direction and if current in clockwise direction then magnetic field will be in - z direction.

5. False

Minimum resistance is obtained by connecting the resistors in parallel. In this minimum resistance is

(6 x 8 x 24)/(6 x 8 + 8 x 24 + 24 x 6) ohm

= 3 ohm

Circle the FALSE statement.
Select one:
a. When an electric current exists in an inductor, energy is
stored in the magnetic field that surrounds it.
b. A resistor stores energy in the electric and magnetic fields
that surrounds it when an electric current exists in it .
c. A charged capacitor stores energy in the electric field
between the plates.
d. In a circuit containing an inductor and capacitor and
oscillations are taking place, energy is alternately stored in the...

Please provide a brief overview on:
chapter 21
1. Can I obtain the net electric field due to two or
more point charges?
2. Can I obtain the net Coulomb force on a point charge
due to two or more point charges?
3. Can I draw physical quantities (for example,
velocity, forces or electric fields) involved in a given problem in
a diagram?
4. Do I have a good "qualitative" understanding of the
motion of a charged particle in a...

1) 2 point charges are separated by a distance of 8 cm. The left
charge is 48 mC and the right charge is -16mC. Using a full sheet
of paper: draw the 2 charges separated by 8cm, centered in the
sheet. (if you are missing a ruler estimate 8cm as ⅓ a paper sheet
length). [6] a) Draw field lines to indicate the electric fields
for this distribution. [4] b) Draw 3 equipotential surfaces, 1
each, that pass: -Through the...

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