The Lorentz Force describes how a moving charge receives a force due to magnetic

Question

The Lorentz Force describes how a moving charge receives a force due to magnetic field. This force is perpendicular to the direction of the charge and the magnetic field. Here you will get practice in applying the right-hand rule. The strength of the force will depend on the amount of current and strength of the field as well as the orientation. Be careful in applying these and describing the effects. Take the variable gap magnet and determine which direction the magnetic field flows. ( find which side of the gap is North and which is South). Set up the rectangular loop of wire as shown to the right and adjust the height of the horizontal rod as needed. You may need to remove the swinging pendulum used in section (E). Connect the power supply to the loop using the horizontal support as shown to the right. Turn the voltage down on the power supply and then turn the power supply on. Slowly increase the voltage. What happens? Draw and explain the results in terms of the Lorent

Explanation / Answer

The Lorentz force on a current carrying wire is given by F = I*(L X B) where I = current in wire, L = length of current carrying wire inside magnetic field. B = applied magnetic field.

4. On increasing the voltage slowly, the current in wire increases, as a result deflection due to Lorentz force increases.

5. i) The current in the wire follows Ohm's law and hence is controlled by the applied voltage. So the applied voltage can be used as a proxy for the current.

ii)On changing the distance between the plates, the effective magnetic field strength at the position of the wire is changed. So the deflection due to Lorentz force changes,

iii) the reversal of current direction is equivalen to replacing L by -L in the expression for the Lorentz force. so the direction of deflection also reverses.

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