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Commutator and Magnetic Dipole Quiz

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Questions and Answers

What is the formula to calculate torque?

R plus F
R multiplied by F
R divided by F
R cross F (correct)

In an electric motor, what keeps the current-carrying loop rotating?

Electric field
Gravity
Inertia
Magnetic field (correct)

What happens when the loop in an electric motor is slightly moved from the equilibrium point?

It experiences forces pushing it back to equilibrium (correct)
It speeds up
It changes its color
It stops moving

Which position results in unstable equilibrium for a loop in a magnetic field?

Loop perpendicular to the magnetic field (B) Signup and view all the answers

What is the torque of a current (I) times area (A) times magnetic field (B) known as?

$I \times A \times B$ (A) Signup and view all the answers

How does switching the direction of the current in an electric motor affect the loop?

Reverses the forces acting on the loop (D) Signup and view all the answers

When is there no torque on a current-carrying wire in a magnetic field?

When the loop is perpendicular to the magnetic field (D) Signup and view all the answers

What causes a torque on a magnetic dipole?

Magnetic field (B) Signup and view all the answers

What is used in an electric motor to change the direction of forces acting on a current-carrying loop?

Brushes (A) Signup and view all the answers

In which position is there stable equilibrium for a loop in a magnetic field?

Loop parallel to the magnetic field (A) Signup and view all the answers