Fleming's Right Hand Rule - UNSOLVED PRACTICE SET

Q7. State Fleming's Right Hand Rule. Clearly describe what each of the three fingers (thumb, first finger, middle finger) represents.

Q8. A straight conductor moves vertically downward through a horizontal magnetic field pointing from South to North. Using Fleming's Right Hand Rule, determine the direction of the induced current in the conductor.

Q9. Compare Fleming's Left Hand Rule and Fleming's Right Hand Rule: which quantities are 'given' (known) and which is 'found' (the result) in each rule?

Q10. If a conductor moves through a magnetic field but its motion is PARALLEL to the field lines (not perpendicular), what happens to the induced EMF? Relate this to Fleming's Right Hand Rule.

Q11. If the direction of the magnetic field is reversed (motion of conductor unchanged), how does the induced current direction change, according to Fleming's Right Hand Rule?

Q12. Explain the memory connection: 'Right hand → Generator, Left hand → Motor'. Why does this pairing make physical sense in terms of energy conversion direction?

Q13. Explain Fleming's Right Hand Rule in complete detail. Your answer must cover:
(a) the precise statement of the rule (positioning of thumb, first finger, middle finger),
(b) what each finger represents (Motion, Field, induced Current),
(c) a worked example: given the direction of motion (say, conductor moving upward) and field direction (say, into the page), determine the direction of induced current step-by-step,
(d) why the three quantities must be mutually perpendicular for the rule to directly apply, and
(e) the practical importance of this rule in designing electric generators.

Q14. A straight conducting rod is moved to the right through a magnetic field that points vertically downward (into the plane of a horizontal table, if viewed from above the rod's motion).
(a) Using Fleming's Right Hand Rule, determine the direction of the induced current in the rod.
(b) If the rod is now moved to the left (field unchanged), what is the new direction of induced current? 

(c) If the rod's motion is reversed back to the right, but the magnetic field is also reversed (now pointing upward), what is the induced current direction now — same as (a) or different?
(d) What happens to the induced current if the rod is moved diagonally, partly along the field direction and partly perpendicular to it?

Q15. Apply Fleming's Right Hand Rule to explain the working of a simple AC generator's rotating coil. 

(a) As the coil rotates in a magnetic field, different parts of the coil move in different directions at any instant — describe the motion of the two vertical sides of a rectangular coil as it rotates.
(b) Using Fleming's Right Hand Rule, explain why the induced current in one side of the coil is in the opposite direction to the induced current in the other side at any given instant (and why this is actually consistent — current flows in one continuous direction around the loop).
(c) As the coil completes half a rotation, the sides swap their direction of motion. How does this affect the direction of the induced current in the external circuit?
(d) This is why the output of a basic generator is called 'alternating current' — explain this connection.

Q16. A straight metal rod is moved upward through a magnetic field pointing horizontally from West to East. 

(a) Using Fleming's Right Hand Rule, determine the direction of the induced current in the rod (North, South, East, or West along the rod).
(b) If the rod's motion is changed to downward (field unchanged), what is the new induced current direction?
(c) If the rod moves upward but the field is reversed (now East to West), compare the induced current direction to part (a).

Q17. A bicycle dynamo (used for bicycle lights in some parts of India) works on electromagnetic induction: a small magnet rotates near a coil as the bicycle wheel turns.
(a) Explain, using the principle behind Fleming's Right Hand Rule (relative motion between magnet and coil), how pedalling the bicycle produces current for the light.
(b) Why does the bicycle light get brighter when you pedal faster?
(c) Why does the light go off completely when the bicycle stops, unlike a battery-powered light?
(d) Some modern bicycles use battery-powered LED lights instead of dynamos — what is one advantage and one disadvantage of each system?

Q18. In an AC generator, a rectangular coil rotates between the poles of a magnet. At a particular instant, side AB of the coil moves upward through a magnetic field pointing from the North pole (left) to the South pole (right) of the magnet.
(a) Using Fleming's Right Hand Rule, find the direction of induced current in side AB at this instant. 

(b) At the same instant, side CD (on the opposite side of the coil) moves downward through the same field. Find the direction of induced current in CD.
(c) Do the currents in AB and CD (as found in parts a and b) work together to drive current around the loop in one consistent direction, or do they oppose each other? Explain why this makes physical sense for a single conducting loop.