Homework Answers
From Ohm's law: \(\mathrm{V}=\mathrm{IR}\)
Current is nothing but the movement of amount of charge per unit time, if the speed of the magnet is doubled, the current is also doubled. the current is directly proportional to induced emf, when the resistance is constant. so the voltage is doubled when the magnet speed is doubled. answer: twice as great
Induced emf: \(\mathrm{V}=\mathrm{N}[\mathrm{d} @ / \mathrm{dt}], @=\) magnetic flux
from the above relation, it is clear that the induced emf increases with inreasing of number of turns of the coil.
so, the induced emf and number of turns of the coil, both are increased by the same factor. this means that their ratio is constant, as a result the induced current remains constant. Answer: unchanged.
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When a magnet is plunged into a coil at speed nu, as shown in the figure,...
A Magnet and a Coil When a magnet is plunged into a coil at speed u,...
A Magnet and a Coil When a magnet is plunged into a coil at speed u, as shown in the figure, a voltage is induced in the coil and a current flows in the circuit (Figure 1) Part B The same magnetis plunged into a coil that has twice the number of turns as before. The magnet is shown before it enters the coil in the figure (Figure 2 the magnetis again the induced current in the coil is the speed of
A magnet is moving away from a stationary coil with speed v, as shown in the...
A magnet is moving away from a stationary coil with speed v, as shown in the figure. What is the direction of the induced current I at resistor R connected to coil? magnet O The current is going up. There is no current at resistor R. O O The current is going down. Submit Request Answer
A magnet and a coil are oriented as shown in (Figure 1) . The magnet is...
A magnet and a coil are oriented as shown in (Figure 1) . The magnet is moved rapidly into the coil, held stationary in the coil for a short time, and then rapidly pulled back out of the coil.
Choose the correct graph of the reading of the ammeter as a function of time. The ammeter registers a positive value when current goes into the "+" terminal.
A.
B.
C.
D.
A magnet and a coil are oriented as shown...
(c) A magnet moves down through a coil as shown in Figure 2. Figure 2 i. Sketch and explain what ...
(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...
What is the direction of the induced magnetic field in the coil when the bar magnet is moving...
A coil is suspended around an axis which is colinear with the axis of a bar magnet.The coil is connected to a resistor with ends labeled “a” and “b”. The bar magnet moves from left to right with North and South poles labeled as in the figure. UseLenz’s law to answer the following question concerning the direction of induced currents and magnetic fields.What is the direction of the induced magnetic field in the coil when the bar magnet ismoving from...
suppose that when you move a magnet through a boiba 40 turns at a certain speed,...
suppose that when you move a magnet through a boiba 40 turns at a certain speed, it induces an electric potential of 10 v through the coil .. if you move the same magnet through a coil 80 turns to the same speed. what voltage will be induced on the coil, assuming both coils are very compacted? a) 20 v b) 5 v c) not enough information d) 10 v
Pre-Lab Exercise N A bar magnet is moved relative to a coil as shown in the...
Pre-Lab Exercise N A bar magnet is moved relative to a coil as shown in the diagram. Which direction will the induced current flow if: 1. The magnet is moving into the coil 2. The magnet is moving out of the coil 3. The coil rotates clockwise until it makes a 45° angle with the magnet 3 חרחרוחב -
A bar magnet induces a current in an N-turn coil as the magnet moves closer to...
A bar magnet induces a current in an N-turn coil as the
magnet moves closer to it as shown in (Figure 1) . The coil's
radius is R m, and the average induced emf across the bulb
during the time interval is ? V.
A. Find the rate of change of magnetic field
Express your answer in terms of the variables
?,
N,
R, and appropriate
constants.
Part B
Determine the induced current. Assume that R0 is the
resistance of...
In part III of the experiment, you will move a permanent magnet into a coil and...
In part III of the experiment, you will move a permanent magnet into a coil and measure the induced current (see Figure 29-2 in the book). If you find a positive current when you bring the north pole of the magnet closer, what do you expect to find when you pull the magnet back? a positive current. a negative current. Zero current.
1) Induced emf in a coil depends on a) Relative motion of magnet b) Relative motion...
1) Induced emf in a coil depends on a) Relative motion of magnet b) Relative motion of coil c) Both d) None 2) When is passed through coil is there magnet a a (changing/unchanging) magnetic flux through the coil that induces an electromotive force(emf) in the coil; the incoming flux is (equal /not equal)to the outgoing flux. 3) While a magnet is moved toward the end of a solenoid, a voltage difference is induced between the two ends of the...
A Magnet and a Coil When a magnet is plunged into a coil at speed u, as shown in the figure, a voltage is induced in the coil and a current flows in the circuit (Figure 1) Part B The same magnetis plunged into a coil that has twice the number of turns as before. The magnet is shown before it enters the coil in the figure (Figure 2 the magnetis again the induced current in the coil is the speed of
A magnet is moving away from a stationary coil with speed v, as shown in the figure. What is the direction of the induced current I at resistor R connected to coil? magnet O The current is going up. There is no current at resistor R. O O The current is going down. Submit Request Answer
A magnet and a coil are oriented as shown in (Figure 1) . The magnet is moved rapidly into the coil, held stationary in the coil for a short time, and then rapidly pulled back out of the coil.
Choose the correct graph of the reading of the ammeter as a function of time. The ammeter registers a positive value when current goes into the "+" terminal.
A.
B.
C.
D.
A magnet and a coil are oriented as shown...
(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...
Pre-Lab Exercise N A bar magnet is moved relative to a coil as shown in the diagram. Which direction will the induced current flow if: 1. The magnet is moving into the coil 2. The magnet is moving out of the coil 3. The coil rotates clockwise until it makes a 45° angle with the magnet 3 חרחרוחב -
A bar magnet induces a current in an N-turn coil as the
magnet moves closer to it as shown in (Figure 1) . The coil's
radius is R m, and the average induced emf across the bulb
during the time interval is ? V.
A. Find the rate of change of magnetic field
Express your answer in terms of the variables
?,
N,
R, and appropriate
constants.
Part B
Determine the induced current. Assume that R0 is the
resistance of...
In part III of the experiment, you will move a permanent magnet into a coil and measure the induced current (see Figure 29-2 in the book). If you find a positive current when you bring the north pole of the magnet closer, what do you expect to find when you pull the magnet back? a positive current. a negative current. Zero current.
1) Induced emf in a coil depends on a) Relative motion of magnet b) Relative motion of coil c) Both d) None 2) When is passed through coil is there magnet a a (changing/unchanging) magnetic flux through the coil that induces an electromotive force(emf) in the coil; the incoming flux is (equal /not equal)to the outgoing flux. 3) While a magnet is moved toward the end of a solenoid, a voltage difference is induced between the two ends of the...
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