Chapters 22 and 23 questions
Answer all the questions in more details for full credit
Part a
(Related to chapter 22) Coulomb’s Law is a force law between charged bodies. It relates the force to the magnitude and charge on the two bodies and the distance between them by the relationship:
Where
q1 and q2 is the amount of charge in Coulombs
r is the distance in meters between the charges
k is the Coulomb’s Law constant = 9×109 N•m2/C2 or 9,000,000,000 N•m2/C2
Answer the following problem
What is the force between two identical positive charges with a magnitude of 6 x 10-6 coulombs each and separated by 1m?
Part b
(Related to chapter 23) Ohm’s Law deals with the relationship between voltage (V) and current (I) and resistance (R). This relationship gives Ohm’s Law.
V = I R
Where
V is the voltage
I is the current
R is the resistance
Answer the following problem
What is the resistance when a battery with voltage 10-V is connected to a resistor, the current in the resistor is 2 A?
HW for chapter 24 and 25
Answer all the questions in more details for full credit
1) Like kinds of magnetic poles repel while unlike kinds of magnetic poles 1) _______
A) attract. B) may attract or repel. C) repel also.
2) Surrounding every magnet is 2) _______
A) an electric field. B) a magnetic field.
C) both of these D) neither of these
3) An iron nail is more strongly attracted to the 3) _______
A) north pole of a magnet. B) south pole of a magnet.
C) either of these D) neither of these
4) Magnet A has twice the magnetic field strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N. The amount of force that magnet A exerts on magnet B is
A) exactly 100 N. B) at or about 50 N. C) need more information4) _______
5) Solar winds headed in Earth’s direction are deviated mainly by 5) _______
A) Earth’s magnetic field. B) the upper atmosphere.
C) Earth’s radiation belts. D) the troposphere.
6) The amount of current produced by electromagnetic induction depends on the 6) _______
A) resistance of the circuit to which it is connected.
B) amount of induced voltage.
C) both of these
D) neither of these
7) A device that transforms mechanical energy into electrical energy is a 7) _______
A) transformer.
B) generator.
C) magnet.
D) motor.
E) none of the above
8) An efficient step-up transformer boosts 8) _______
A) voltage.
B) energy.
C) power.
D) all of the above
E) none of the above
9) A step-up transformer steps up voltage by ten times. If voltage input is 120 volts, voltage output is 9) _______
A) 1200 V.
B) 12000 V.
C) 60 V.
D) 120 V.
E) none of the above
10) The voltage across the input terminals of a transformer is 120 V. The primary has 50 loops and the secondary has 25 loops. The voltage the transformer delivers is 10) ______
A) 30 V.
B) 120 V.
C) 240 V.
D) 60 V.
E) none of the above
11) To reduce the danger of self-induction 11) ______
A) simply pull the circuit plug. B) turn off the switch to the circuit.
C) either of these D) neither of these
12) Rapid change of a magnetic field induces 12) ______
A) an electric field.
B) a magnetic field of the same magnitude.
C) a magnetic field of greater magnitude.