Refer to the diagram. A magnet is maved away from a coil that is connected to a galvanometer. Explain how applying Lenz's law helps determine the direction of the induced emf in the coil. What is the direction of the induced emf in the coil? Explain how the direction can be verified using the second right-hand rule. volts

Refer to the diagram. A magnet is maved away from a coil that is connected to a galvanometer. Explain how applying Lenz's law helps determine the direction of the induced emf in the coil. What is the direction of the induced emf in the coil? Explain how the direction can be verified using the second right-hand rule. volts

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter13: Electromagnetic Induction

Section: Chapter Questions

Problem 23CQ: A coil is moved through a magnetic field as shown below. The field is uniform inside the rectangle...

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Similar questions

A coil is moved through a magnetic field as shown below. The field is uniform inside the rectangle and zero outside. What is the direction of the induced current and what is the direction of the magnetic force on the coil at each position shown?
When a magnet is thrust into a coil as in Figure 23.4(a), what is the direction of the louse exerted by the coil on the magnet? Draw a diagram showing the direction of the current induced in the coil and the magnetic field it produces, to justify your response. How does the magnitude of the force depend on the resistance of the galvanometer?
The armature and field coils of a series-wound motor have a total resistance of 3.0 . When connected to a 120-V source and running at normal speed, the motor draws 4.0 A. (a) How large is tire back emf? (b) What current will the motor draw just after it is turned on? Can you suggest a way to avoid this large initial current?
Shown below is a conducting rod that slides along metal rails. The apparatus is in a uniform magnetic field of strength 0.25 T, which is directly into the page. The rod is pulled to the right at a constant speed of 5.0 m/s by a force . The only significant resistance in the circuit comes from the 2.0resistor shown. (a) What is the emf induced in the circuit? (b) What is the induced current? Does it circulate clockwise or counter clockwise? (c) What is the magnitude of(d) What are the power output of and the power dissipated in the resistor?
Use Lenzs law 10 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 Figure P.31.22. (a) What is the direction of the induced current in the resistor R in Figure P.S1.22a when the bar magnet is moved to the left? (b) What is the direction of the current induced in the resistor R immediately after the switch S in Figure P31.22b is closed? (c) What is the direction of the induced current in the resistor R when the current I in Figure P31.22c decreases rapidly to zero?
An Ampere loop is chosen as shown by dashed lines for a parallel constant magnetic field as shown by solid arrows. Calculate BdI for each side of the loop then find the entire BdI . Can you think of an Ampere loop that would make the problem easier? Do those results match these?
Referring to Figure 23.57(b), what is the direction of the current induced in the coil: (a) If the current in the wire increases? (b) If the current in fine wire decreases? (c) If the current in the wire suddenly changes direction? Explicitly show how you follow the steps in the Problem-Solving Strategy for Lenz’s Law.
A 50-turn rectangular coil with dimensions 0.15m0.40m rotates in a uniform magnetic field of magnitude 0.75 T at 3600 rev/min. [a) Determine the emf induced in the coil as a function of time, (b) If the coil is connected to a 1000 resistor, what is the power as a function of time required to keep the coil turning at 3600 rpm? (c) Answer part (b) if the coil is connected to a 2000 resistor.
Is the direction of the magnetic field shown in Figure 24.6 (a) consistent with the right—hand rule for current (RHR-2) in the direction shown in the figure?
A rectangular copper loop of mass 100 g and resistance 0.2 is in a region of uniform magnetic field that is perpendicular to the area enclosed by the ring and horizontal to Earth's surface (see below). The loop is let go from rest what it is at the edge of the nonzero magnetic field region. (a) Find an expression for the speed when the loop just exits the region of uniform magnetic field. (b) If it was let go at t = 0, what is the tune when it exits the region of magnetic field for the following values, a=25cm,b=50cm,B=3T,g=9.8m/s2 ?Assumethat the magnetic field of the induced current is negligible compared to 3 T.
A stationary coil is in a magnetic field that is changing with time. Does the emf induced in the coil depend on the actual values of the magnetic field?
What is the value of the magnetic flux through the coil in Figure 23.56 (b) due to the wire?