Magnetic Field from a Current-Carrying Wire Quiz

What happens to the compass needles when the current starts flowing through the wire?

• They align perpendicular to the wire.

• They align parallel to the wire.

• They stop moving.

• They align with the Earth's magnetic field.

Which rule is used to determine the direction of the magnetic field around a current-carrying wire?

• Thumb rule

• Index finger rule

• Right-hand rule

• Left-hand rule

When using the right-hand rule, what does the thumb represent?

• Direction of the magnetic field

• Direction of the electron flow

• Direction of the current

• Direction of the wire

How is the magnetic field represented on the left-hand side of a wire on a 2D plane?

• With a cross (X)

• With a dot (•)

• With a line (—)

• With a square (□)

What does a dot (•) represent in the 2D representation of a magnetic field?

• Magnetic field moving into the page

• Magnetic field moving out of the page

• Magnetic field moving parallel to the page

• Magnetic field moving perpendicular to the page

Which factor is directly proportional to the magnetic field strength?

• Distance from the wire

• Current through the wire

• Temperature of the wire

• Length of the wire

What happens to the magnetic field strength as you move further away from the wire?

• It decreases

• It increases

• It remains constant

• It fluctuates

What is the unit of measurement for magnetic field strength?

• Ampere

• Joule

• Newton

• Tesla

In the formula for magnetic field strength, what does 'R' represent?

• Resistance

• Radius

• Voltage

• Current

What is the value of the constant 'mu zero' used in the magnetic field strength formula?

• 3.14 x 10^-7

• 4π x 10^-7

• 1 x 10^-7

• 2π x 10^-7