3) A permanent magnet of length L is dropped from a height H through a coil....
3) A permanent magnet of length L is dropped from a height H through a coil. What is the ratio of the emf induced in the coil at the moment the bottom of the magnet enters the coil to the emf induced in the coil at the moment the top of the magnet leaves the coil?
Homework Answers
The ratio will be greater than 1.
This is because when the magnet enters the coil, it is slowed down
due to the induced EMF. So the rate of change of flux is less when
it leaves the magnet compared with when the magnet enters the coil
and so is the induced EMF.
Add Answer to:
3) A permanent magnet of length L is dropped from a height H
through a coil....
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A permanent magnet is dropped south-end-down through a horizontal circular coil with a radius of 10 cm, having 200 turns, and a total resistance of 5π ohms. Find the magnitude and direction of the current induced in the coil when the magnet has passed through and the field through the coil is decreasing at 40 mT/s.
Magnetic induction lab: 5 questions A vertical bar magnet is dropped through the center of a...
Magnetic induction lab: 5 questions
A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its south pole leading. At the moment just before the south pole passes through the loop, what is the direction of the induced current in the loop (viewed from above)? 2. Explain your answer to the previous question. 3. A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its south pole leading....
I did experiment that dropping magnet through a coil for induced emf from each different height...
I did experiment that dropping magnet through a coil for induced emf from each different height and check the induced emf is increased proportionally as drop height is higher and higher. so I thought the two equations I need to use would be the v = √2gh , induced emf= -NAdt/dΦ as far as I know. Is that right? if not, could anyone explain me that?...
2. A bar magnet is dropped through a loop of wire as shown. Looking at the...
2. A bar magnet is dropped through a
loop of wire as shown. Looking at the loop from above,
a) What is the direction of the
current as the magnet enters the loop from the top?
b) What is the direction of the
current as the magnet as it leaves the loop from the bottom?
c) What is the direction of the
current at the instant it is in the middle half above and half
below?
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(c) A magnet moves down through a coil as shown in Figure 2. Figure 2 i. Sketch and explain what the direction of the induced (2 marks) (2 marks) Explain what's need to be done in order to generate a (2 marks) (2 marks) current should be. ii. What would happen to the emf induced if the motion of the magnet is reversed. larger emf. iv. Would there be any emf induced if the magnet stops moving?
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Consider the example of a permanent magnet (B-field pointing upward, so N on top and S...
Consider the example of a permanent magnet (B-field pointing upward, so N on top and S on bottom) falling through a long metal pipe. You have picked a spot in the middle of the pipe and the magnet is already below it and falling away. What is the induced current in the pipe and the resulting magnetic field. Explain completely.
1) Induced emf in a coil depends on a) Relative motion of magnet b) Relative motion...
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You are asked to build a speedometer for a car. One natural design is to attach...
You are asked to build a speedometer for a car. One natural design is to attach a magnet to the rotating wheel hub and a sense coil to the non-rotating axle. At 60mph, a 16in tire completes a full rotation is 0.1s. If the magnet is mounted 15cm from the axis, it travels at a speed of upsilon = 9 m/s. The sense coil is square with sides w = 0.5cm with 15 turns. The magnet produces a fairly uniform...
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A square loop of length a and resistance R, is dropped from a height of h....
A square loop of length a and resistance R, is
dropped from a height of h. A magnetic field exists
everywhere, perpendicular to the loop area which varies with height
according to:
Given:
a=8.3 m, R=2.3, h=0.7m,
=6.9T,
D=5.9m
What is the current in the loop at the moment of impact with the
group? Neglect the force the magnetic field exerts on the loop,
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We were unable to transcribe this imageWe...
Magnetic induction lab: 5 questions
A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its south pole leading. At the moment just before the south pole passes through the loop, what is the direction of the induced current in the loop (viewed from above)? 2. Explain your answer to the previous question. 3. A vertical bar magnet is dropped through the center of a horizontal loop of wire, with its south pole leading....
2. A bar magnet is dropped through a
loop of wire as shown. Looking at the loop from above,
a) What is the direction of the
current as the magnet enters the loop from the top?
b) What is the direction of the
current as the magnet as it leaves the loop from the bottom?
c) What is the direction of the
current at the instant it is in the middle half above and half
below?
S N
(c) A magnet moves down through a coil as shown in Figure 2. Figure 2 i. Sketch and explain what the direction of the induced (2 marks) (2 marks) Explain what's need to be done in order to generate a (2 marks) (2 marks) current should be. ii. What would happen to the emf induced if the motion of the magnet is reversed. larger emf. iv. Would there be any emf induced if the magnet stops moving?
(c) A magnet...
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You are asked to build a speedometer for a car. One natural design is to attach a magnet to the rotating wheel hub and a sense coil to the non-rotating axle. At 60mph, a 16in tire completes a full rotation is 0.1s. If the magnet is mounted 15cm from the axis, it travels at a speed of upsilon = 9 m/s. The sense coil is square with sides w = 0.5cm with 15 turns. The magnet produces a fairly uniform...
A square loop of length a and resistance R, is
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Given:
a=8.3 m, R=2.3, h=0.7m,
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group? Neglect the force the magnetic field exerts on the loop,
give a positive answer in ampere, and use g=10m/s^2
We were unable to transcribe this imageWe...
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