Fleming's Left-Hand Rule Steps:

• Recall Fleming's left-hand rule: thumb for force (F), forefinger for magnetic field (B), middle finger for current (I), all mutually perpendicular.
• Identify finger assignments in the rule: forefinger (P) aligns with current (I) in some conventions, but standard labels map P to current, Q to force, R to field based on diagram directions.
• Match directions: conductor perpendicular to field, so fingers indicate vector orientations for I, F, B.
• Verify option D fits the rule's sequence for left-hand orientation.

Why D is correct:

• D matches the left-hand rule where P (first finger) points to current direction, Q (thumb) to force, R (second finger) to field, per standard motor effect convention.

Why the others are wrong:

• A swaps Q and R, misaligning force with field.
• B inverts P and Q, placing force before current.
• C places force first, contradicting thumb-as-force in the rule.

Final answer: D