In the laboratory demonstration shown in the diagram, a copper rod rolls at a steady speed down the sloping parallel copper rails. The rails are in the region of a strong magnetic field that acts vertically downwards.

a. Explain why the voltmeter shows a deflection.

b. State, with reasons, the effect on the voltmeter deflection of the following changes:

i. Increasing the strength of the magnetic field,

ii. Slightly increasing the slope of the copper rails.

iii. Changing the direction of the magnetic field so it is parallel to the copper rails and directed down the slope.

Transcribed Image Text:

very sensitive centre-zero direction of voltmeter V -connecting wires magnetic field copper rod parallel copper rails sloping downwar ds in direction of arrow