⚡ Show all working — the AI marks against the AQA mark scheme. Method marks awarded for correct working even if the final answer is wrong.
3 marksF = BIL calculationAQA 8463 P2 style 🔢 Calculator
A wire of length 0.15 m carries a current of 4 A in a magnetic field of flux density 0.3 T (perpendicular to the field). Calculate the force on the wire. (2 marks)
Hint: F = BIL. All units are already standard. Multiply directly.
+30 XP
1 markFleming left hand ruleAQA 8463 style
In Fleming's left-hand rule, what does the first finger represent?
A The direction of the current
B The direction of the force (motion)
C The direction of the magnetic field
D The direction of the magnetic flux
3 marksMotor operationAQA 8463 style
Explain why the split-ring commutator is essential for a DC electric motor to rotate continuously. (3 marks)
Hint: Explain what would happen without the commutator (the coil would oscillate). Then explain what the commutator does (reverses current at the right moment to maintain rotation direction).
+30 XP
1 markForce directionAQA 8463 style
If both the current direction and magnetic field direction are both reversed simultaneously, what happens to the force on the conductor?
A The force doubles in magnitude
B The force reverses direction
C The force remains in the same direction (double reversal = same direction)