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Questions and Answers
What does the thumb represent when determining the direction of force on a current-carrying wire in a magnetic field?
What does the thumb represent when determining the direction of force on a current-carrying wire in a magnetic field?
What is the role of the carbon brushes in a slip ring system?
What is the role of the carbon brushes in a slip ring system?
Which of the following factors does NOT affect the force acting on a current-carrying wire in a magnetic field?
Which of the following factors does NOT affect the force acting on a current-carrying wire in a magnetic field?
How many brushes are in contact with the slip rings in this system?
How many brushes are in contact with the slip rings in this system?
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Which statement is true about the brushes in this system?
Which statement is true about the brushes in this system?
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What effect does cutting the primary coil have on the secondary coil?
What effect does cutting the primary coil have on the secondary coil?
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If the magnetic flux density (B) is doubled while keeping the current (I) and length (L) constant, what happens to the force (F) on the wire?
If the magnetic flux density (B) is doubled while keeping the current (I) and length (L) constant, what happens to the force (F) on the wire?
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What happens to the galvanometer pointer if the primary switch has been closed for a few seconds?
What happens to the galvanometer pointer if the primary switch has been closed for a few seconds?
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How is the force (F) on a current-carrying wire mathematically represented?
How is the force (F) on a current-carrying wire mathematically represented?
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What units should magnetic flux density (B) be in to ensure that the force (F) is measured in Newtons?
What units should magnetic flux density (B) be in to ensure that the force (F) is measured in Newtons?
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What happens to the induced currents in the coil?
What happens to the induced currents in the coil?
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What material are the brushes commonly made from in this setup?
What material are the brushes commonly made from in this setup?
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Which statement accurately describes the relationship between emf and galvanometer movement?
Which statement accurately describes the relationship between emf and galvanometer movement?
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If electric current through the primary coil is constant, what can be inferred about the secondary coil?
If electric current through the primary coil is constant, what can be inferred about the secondary coil?
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What is the primary consequence of cutting the primary coil without any current in it?
What is the primary consequence of cutting the primary coil without any current in it?
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What causes the induced current to flow in the coil?
What causes the induced current to flow in the coil?
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Which rule determines the direction of the induced current in the coil?
Which rule determines the direction of the induced current in the coil?
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What characteristic of the induced current is affected by the motion of the coil?
What characteristic of the induced current is affected by the motion of the coil?
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What happens to the magnetic flux linked with the coil when it rotates?
What happens to the magnetic flux linked with the coil when it rotates?
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Which of the following best describes the nature of the induced current when the coil rotates?
Which of the following best describes the nature of the induced current when the coil rotates?
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What happens to the direction of the induced current in the external circuit as the coil rotates?
What happens to the direction of the induced current in the external circuit as the coil rotates?
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What type of current is induced in the external circuit due to the rotation of the coil?
What type of current is induced in the external circuit due to the rotation of the coil?
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How frequently does the induced current change direction as the coil completes a rotation?
How frequently does the induced current change direction as the coil completes a rotation?
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Why does the induced current not remain constant?
Why does the induced current not remain constant?
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What aspect of the coil's movement leads to the alternating current?
What aspect of the coil's movement leads to the alternating current?
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Study Notes
Fleming's Left-Hand Rule
- Thumb points in the direction of motion of the wire.
- Pointer (first finger) points in the direction of the magnetic field.
- Middle (second finger) points in the direction of the current through the wire.
Factors Affecting Force on a Current-Carrying Wire
- Force is proportional to the length of the wire (FαL)
- Force is proportional to the current in the wire (FαI)
- Force is proportional to the magnetic flux density (FαB)
- Therefore, Force (F) is proportional to IBL: F = Constant ×I B L
Induced EMF in Secondary Coil
- When a switch in the primary coil is closed, an induced EMF is generated in the secondary coil.
- The induced EMF causes the galvanometer pointer to deflect.
- If the switch in the primary coil is closed for an extended period, there is no induced EMF in the secondary coil.
Slip Rings and Carbon Brushes
- Each slip ring is connected to a carbon brush that remains stationary.
- The induced currents in the coil pass through the slip rings and carbon brushes to the external circuit.
Alternating Current Generation
- When the coil rotates, its sides cut across magnetic field lines, causing a change in magnetic flux linked with the coil.
- This change in flux induces a current in the coil.
- The induced current has a variable intensity and changing direction, determined by Fleming’s right-hand rule.
- The induced current in the external circuit changes direction every half rotation of the coil, resulting in an alternating current.
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Description
Test your knowledge on Fleming's Left-Hand Rule and the factors affecting the force on a current-carrying wire. This quiz also covers induced EMF in secondary coils and the role of slip rings and carbon brushes in electromagnetism. Prepare to challenge yourself with these key concepts!