The diagrams show two views of a vertical wire carrying a current up through a horizontal card. Points P and Q are marked on the card.

a. Copy the diagram above right. On your copy

i. Draw a complete magnetic field line (line of force) through P and indicate its direction with an arrow,

ii. Draw an arrow through Q to indicate the direction in which a compass placed at Q would point.

b. State the effect on the direction in which compass Q points of

i. Increasing the current in the wire,

ii. Reversing the direction of the current in the wire.

c. The diagram below shows the view from above of another vertical wire carrying a current up through a horizontal card. A cm grid is marked on the card. Point W is 1 cm vertically above the top surface of the card.

Transcribed Image Text:

vertical wire P. view from above the card