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5/30 MCQs for:

Magnetism

Two long parallel wires are placed side-by-side on a horizontal table. If the wires carry current in opposite directions,

One wire is lifted slightly as the other is forced against the table's surface.

The wires attract each other.

Both wires are lifted slightly.

The wires repel each other.

The force on a current-carrying wire in a magnetic field is the strongest when:

The current is at a 60e angle with respect to the field lines.

The current is at a 30e angle with respect to the field lines.

The current is parallel to the field lines.

The current is perpendicular to the field lines.

The SI unit of magnetic field is the:

Weber.

Gauss.

Lorentz.

Tesla.

An electron moving along the +x axis enters a region where there is a uniform magnetic field in the +y direction. What is the direction of the magnetic force on the electron? (+x to right, +y up, and +z out of the page.)

-y direction.

-x direction.

+z direction.

-z direction.

Which of the following is correct?

When a current carrying wire is in your left hand, thumb in the direction of the current, your fingers point in the direction of the magnetic field lines.

When a current carrying wire is in your left hand, thumb in the direction of the magnetic field lines, your fingers point in the direction of the current.

When a current carrying wire is in your right hand, thumb in the direction of the current, your fingers point in the direction of the magnetic field lines.

When a current carrying wire is in your right hand, thumb in the direction of the magnetic field lines, your fingers point in the direction of the current.