The two coils shown in the diagram are wrapped around an iron bar. After the swi

Question

The two coils shown in the diagram are wrapped around an iron bar. After the switch is closed..

a. a current momentarily flows through R from left to right

b. a steady current flows through R from left to right

c. a current momentarily flows through R from right to left

d. a steady current flows through R from right to left

e. no current flows through R

The two coils shown in the diagram are wrapped around an iron bar. After the switch is closed.. a. a current momentarily flows through R from left to right b. a steady current flows through R from left to right c. a current momentarily flows through R from right to left d. a steady current flows through R from right to left e. no current flows through R

Explanation / Answer

Since the magnetic field in the secondary coil changed from zero to a leftward-directed field when the switch

was closed, the magnetic flux through the secondary coil has increased. Thus, current will flow in the secondary

coil to create a magnetic field oriented to the right to oppose this increase in flux. Therefore, you need to

determine the direction in which current must flow through the secondary coil, and thus the resistor, to create a

field through the secondary coil directed to the right. Use the right-hand rule for magnetic fields to find the

direction of this current.

so option (a) is correct answer

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

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