The magnetic field lines around a long straight wire carrying a current are
Salam Academy Original Practice · Proposed mark scheme
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12 questions
The current in a wire is increased. The magnetic field around it
Salam Academy Original Practice · Proposed mark scheme
The current in a solenoid is reversed. The magnetic field
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The magnetic field outside a current-carrying solenoid has a shape like that of
Salam Academy Original Practice · Proposed mark scheme
Which change reverses the force on a current-carrying wire in a magnetic field?
Salam Academy Original Practice · Proposed mark scheme
In a d.c. motor, the split-ring commutator
Salam Academy Original Practice · Proposed mark scheme
Which change makes a d.c. motor turn faster?
Salam Academy Original Practice · Proposed mark scheme
A V motor draws a current of A. Calculate its input power.
Salam Academy Original Practice · Proposed mark scheme
An electromagnet can be made stronger by
Salam Academy Original Practice · Proposed mark scheme
A current-carrying wire lies parallel to a magnetic field. The force on it is
Salam Academy Original Practice · Proposed mark scheme
The W motor lifts a N load through m in s. Calculate its efficiency as a percentage.
Salam Academy Original Practice · Proposed mark scheme
In Fleming's left-hand rule, the thumb shows the direction of
Salam Academy Original Practice · Proposed mark scheme