WorksheetsFleming’s Right Hand Rule
Total questions: 7
Worksheet time: 4mins
Using the right-hand rule shown, a straight conductor moves upward through a uniform magnetic field pointing left. Which finger indicates the direction of the induced EMF and where does it point?
Middle finger, pointing right
Forefinger, pointing downward
Middle finger, pointing downward
Thumb, pointing downward
In the diagram, a conductor AB moves upward between N and S poles. Using Fleming’s right hand rule, which statement best describes the induced current direction and the role of brushes and slip rings in the simple loop generator shown?
Current flows from A to B; slip rings replace the brushes
Current flows from B to A; brushes bypass the slip rings
Current flows from A to B; brushes collect through slip rings
Current flows from B to A; brushes collect through slip rings
A single-turn rectangular coil rotates in a uniform magnetic field. During the first half-cycle, at which angular position does the induced EMF reach its maximum magnitude, and why is the EMF zero at 180° in the same half-cycle?
Maximum at 90°; flux cutting is highest, zero at 180° due to parallel sides
Maximum at 60°; flux linkage peaks, zero at 180° due to coil resistance
Maximum at 90°; commutator reverses polarity, zero at 180° due to back EMF
Maximum at 120°; velocity aligns with field, zero at 180° due to saturation
The coil in a single‑loop generator is rotated to 270°. Which statement best explains the meter reading and the nature of the induced EMF at this position, as shown in the diagram?
EMF becomes zero and current stops entirely
EMF reaches maximum with same direction as at 90°
EMF reaches maximum but reverses direction of flow
EMF decreases gradually while keeping direction unchanged
In the diagrams, the coil completes a 360° mechanical rotation between the N and S poles. At which position of rotation does the induced terminal voltage reach its maximum positive value, and why?
Near 0°, because the coil is aligned with flux
At 90°, because the flux linkage changes fastest
At 180°, because the flux reverses completely
At 270°, because brushes swap contacts
In the simple DC generator shown, which action ensures a dynamically induced EMF according to the basic requirements?
Increase resistance of the conductor without motion
Rotate the magnetic poles while the conductor is stationary
Hold the conductor fixed in a changing magnetic flux
Rotate the conductor through a stationary magnetic flux
In the illustrated generator, which action most directly increases magnetic flux in the pole core without altering the prime mover speed?
Increase DC current to field windings
Add more turns to armature conductors
Rotate armature at higher mechanical speed
Reduce resistance of armature core
