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 Use Lenz’s law to answer the following questions concerning the direction of induced currents:

(a) What is the direction of the induced current in resistor R shown in Figure (a) when the bar magnet is moved to the left?

(b) What is the direction of the current induced in the resistor R right after the switch S in Figure (b) is closed?

(c) What is the direction of the induced current in R when the current I in Figure (c) decreases rapidly to zero?

 

Use Lenz's law to answer the following questions concerning the direction of induced currents. Express your answers in terms of the letter labels a and b in each part of the figure

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A bar magnet is positioned near a coil of wire, as shown in the figure below.

What is the direction of the current through the resistor when the magnet is moved 

(a). to the left 

then,

  1. no current is induced.
  2. current is right to left.
  3. current is left to right.

(b). to the right

then,

  1. no current is induced.
  2. current is right to left.
  3. current is left to right.
For each of the actions depicted, determine thedirection(right, left, or zero) of the current induced to flowthrough theresistor in the circuit containing the secondarycoil.
Part A
A.)
Immediately after the switch is closed,asshown in the figure, (Part A figure) inwhichdirection does the current flow through the resistor?
right
left
zero
Part B
B.)
If the switch is then opened, as shown inthefigure, (Part B figure) in whichdirection doesthe current flow through the resistor?
right
left
zero
Part C
C.)
Immediately after the switch is closed,asshown in the figure, (Part C figure) inwhichdirection does the current flow through the resistor?
right
left
zero
Part D
D.)
If the circuit containing the battery movestothe left, as shown in the figure, (Part Dfigure) inwhich direction does the current flow throughthe resistor?
right
left
zero

A bar magnet is held stationary while a circular loop of wire is moved toward the magnet at constant velocity at position A as in figure. The loop passes over the magnet at position B and moves away from the magnet at position C. Find the direction of the induced current in the loop using Lenz’s law (a) at position A and (b) at position C. (c) What is the induced current in the loop at position B? Explain.

 

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