Understanding Magnetic Fields

What is the relationship between current and magnetic field strength?

• There is no relationship between current and magnetic field strength.

• Magnetic field strength is inversely proportional to the electric current.

• Magnetic field strength is directly proportional to the electric current.

• Magnetic field strength decreases as electric current increases.

How does the distance from a current-carrying wire affect the magnetic field?

• The magnetic field strength decreases as the distance from the wire increases.

• The magnetic field remains constant regardless of the distance from the wire.

• The magnetic field only exists at a fixed distance from the wire.

• The magnetic field strength increases as the distance from the wire increases.

What happens to the magnetic field strength if the current is doubled?

• The magnetic field strength becomes zero.

• The magnetic field strength remains the same.

• The magnetic field strength doubles.

• The magnetic field strength decreases by half.

Which direction does the magnetic field line point around a straight conductor?

• The magnetic field lines point in concentric circles around the conductor, following the right-hand rule.

• The magnetic field lines point straight away from the conductor.

• The magnetic field lines form a square pattern around the conductor.

• The magnetic field lines point in a straight line along the conductor.

What is the formula for calculating the magnetic field around a long straight conductor?

• B = (μ₀ * I) / (4 * π * r)

• B = (I * r) / (μ₀ * 2 * π)

• B = (μ₀ * I * r) / (2 * π)

• B = (μ₀ * I) / (2 * π * r)

How does the type of material surrounding the wire influence the magnetic field?

• The magnetic field is always stronger in vacuum than in any material.

• Only conductive materials can influence the magnetic field.

• The material has no effect on the magnetic field.

• The surrounding material can enhance or weaken the magnetic field depending on its magnetic properties.

What is the effect of increasing the wire's diameter on the magnetic field strength?

• Decreasing the wire's diameter increases the magnetic field strength.

• Increasing the wire's diameter has no effect on the magnetic field strength.

• Increasing the wire's diameter decreases the magnetic field strength.

• Increasing the wire's diameter can increase the magnetic field strength.

How does the magnetic field behave at points equidistant from a straight conductor?

• The magnetic field varies randomly at equidistant points.

• The magnetic field is the same at points equidistant from a straight conductor.

• The magnetic field direction reverses at equidistant points.

• The magnetic field is stronger at points closer to the conductor.

What is the significance of the right-hand rule in determining magnetic field direction?

• The right-hand rule indicates the speed of electric current.

• The right-hand rule is used to calculate resistance in circuits.

• The right-hand rule helps determine the direction of the magnetic field around a current-carrying conductor.

• The right-hand rule determines the voltage across a conductor.

How does the magnetic field strength vary with different types of current (AC vs DC)?

• The magnetic field strength is constant for both AC and DC.

• The magnetic field strength fluctuates for both AC and DC.

• The magnetic field strength is constant for DC and fluctuates for AC.

• The magnetic field strength is stronger for AC than for DC.