Directions: For each multiple-choice question, circle the correct answer.(3 poin

Question

Directions: For each multiple-choice question, circle the correct answer.(3 points each) Which one of the following statements concerning the magnetic field inside (far from the surface) a long, current-carrying solenoid is true? 1. a. The magnetic field is zero. b. The magnetic field is non-zero and nearly uniform. c. The magnetic field is independent of the number of windings d. The magnetic field is independent of the current in the solenoid. e. The magnetic field varies as Lir as measured from the solenoid axis. 2. True/False: Iron is an example of a ferromagnetic material. a. True b. False 3. Circuit A contains a battery, a switch, and a resistor connected in series. Circuit B contains a battery, a switch, an inductor, and a resistor connected in series. Initially, the switch is closed in both circuits. How does the behavior of the current in circuit B compare with that in circuit A as both switches are opened at the same time? a. The current in both circuits decreases at the same rate because inductors do not affect the current in a circuit. b. The current in circuit B decreases more slowly than that for circuit A since the inductor acts to maintain the current in the circuit. The current in circuit B decreases more quickly than that for circuit A since the inductor increases the current in the circuit as its stored energy is released. The behavior of the current in the circuit depends on the inductance of the inductor. If the inductance is small, the current will decrease rapidly; and if the inductance is large, the current will increase for a short time before decreasing. c. d. Consider the magnetic field generated by a long, straight current-carrying wire of radius R. At which of the following locations is the magnetic energy density of the wire the largest? 4. a. 0, at the center of the wire r c. r- R, at the surface of the wire d. R

Explanation / Answer

1) magnetic field inside the solenoid is B = mu_o*N*I/l

N is the no.of windings

I is the current

l is the length of the solenoid

So the correct answer for question 1) is option b)

2) Iron is an example of ferro magnetic material

so the answer is a) True

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