As viewed from above, the induced current of the coils is connected to a resisto

Question

As viewed from above, the induced current of the coils is connected to a resistor R with ends labeled "a" and "b". The other coil is connected to a battery epsilon through a switch S. Use Lenz's law to answer the following question concerning the direction of induced currents. What is the direction of the magnetic field in the coils after the switch is closed for a long period of time? The magnetic field is zero. right to left (B) left to right (B) After switch S has been open for a long period of time, the switch is closed. What is the direction of the internal induced magnetic field by the larger diameter (secondary) coil just after the switch is closed? The magnetic field is zero. left to right (B_induced) right to left (B_induced) What is the direction of the current induced in the resistor A just after the switch is closed? from "a" through R to "b" (I rightarrow) from "b" through R to "a" (leftarrow I) The induced current is zero.

Explanation / Answer

18.

N = number of turns = 130

A = area = 0.059

W = angular speed = 143 rad/s

B = magnetic field = 3 x 10-5 T

induced emf is given as

E = NBA w

E = (130) (3 x 10-5 ) (0.059) (143) = 0.033 volts

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.