This preview has intentionally blurred parts. Sign up to view the full document

View Full Document

Unformatted Document Excerpt

1. The figure below shows a bar magnet, a coil of wire, and a current meter. If the magnet is withdrawn from the coil, is the induced current through the meter: Stud ent Res pon se Valu e Corr ect Ans wer Fee dba ck A. left to right ? 0% 2. The figure below shows a bar magnet, a coil of wire, and a current meter. If the magnet is held at rest, is the induced current through the meter: Stud ent Res pon se Valu e Corr ect Ans wer Fee dba ck A. left to right ? 3. Lenz's Law states that the direction of any magnetic induction effect is such as to oppose the change in the cause producing it. A large current flows through a long straight wire and nearby is a rectangular wire loop. Which of the situations below correctly shows the direction of the current induced in the rectangular loop by the magnetic field of the long straight wire when its current is in the indicated direction and changing as shown? Stud ent Res pon se Valu e Corr ect Ans wer Fee dba ck A. 0% B. 4. A coil is placed near a solenoid as shown in the diagram. Initially the switch is open. The switch is closed at t = 0 and then, after a few seconds, it is opened again at t = t 1 . What is the direction of the induced current in the coil at the two times, t = 0 and t = t 1 ? Stud ent Res pons e Valu e Corr ect Ans wer Feed back A. 5. The figure below show a circuit consisting of a flashlight bulb, rated 9.00 V/3.00 W, and ideal wires and a metal bar with no resistance. The metal bar, shown in grey, is 20.0 cm long and is pulled at constant speed v. A magnetic field of strength 0.200 T is perpendicular to the circuit. With what speed must the metal bar be pulled to light the bulb to full brightness? Stud ent Res pons e Valu e Corr ect Ans wer Feed back A. 6. A circular loop is in a 0.050 T magnetic field. The edge view of the 11.8 cm diameter circular loop can be seen in the figure below. What is the magnetic flux through the loop? Express your answer in units of mWb , and to two significant figures , where mWb = 10-3 Wb. Note: Enter only your numerical result in the box. Student Respons e Value Correct Answer Answer: 0.27 100% 2.7E-1 (2.7 10- 1 ) General Feedback: 7. A conductor is formed into a loop that encloses an area of 1.0 m 2 . The loop is oriented at a 30.0 angle with the xy-plane. A varying magnetic field is oriented parallel to the z-axis. If the maximum emf induced in the loop is 40.0 V, what is the maximum rate at which the magnetic field strength is changing? Stud ent Res pon se Valu e Corr ect Ans wer Fee dba ck 1. 46 T/s 100 % 2. 80 T/s 3. 8.8.... View Full Document

End of Preview

Sign up now to access the rest of the document