Physics Quiz on Magnetic Fields and Uncertainty

What is the correct method to determine the direction of the magnetic field around a wire with current?

• Use the left-hand rule

• Use the right-hand rule

• Use a compass

• Use a voltmeter

Why is it incorrect to draw concentric circles with equal spacing around a wire with current?

• The magnetic field is strongest at the center

• The magnetic field weakens with distance from the wire

• The magnetic field is uniform

• The magnetic field is non-existent

Which formula is used to calculate the magnetic force in the context of determining magnetic flux density?

• F = BIL

• F = mv^2/r

• F = qvB

• F = ma

How do you calculate the percentage uncertainty of a measurement?

• Divide the absolute uncertainty by the value and multiply by 100

• Multiply the absolute uncertainty by the value and divide by 100

• Add the absolute uncertainty to the value and multiply by 100

• Subtract the absolute uncertainty from the value and divide by 100

What is the purpose of rounding the percentage uncertainty to one significant figure?

• To simplify calculations

• To match the precision of the measurement

• To reduce errors

• To increase accuracy