Physics · May / June 2019 · Paper 11 · Question 29

Two vertical wires pass at right-angles through a piece of card. There is a large current in each wire in the direction shown. [diagram: plotting compass on card, current into card, current out of card] A plotting compass is placed on the card. Which diagram shows the direction in which the needle of the plotting compass points?

1. A[compass needle pointing up]
2. B[compass needle pointing down]
3. C[compass needle pointing left]
4. D[compass needle pointing right]

As printed in the paper