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Question

Hikers often use a compass and a map to determine their location. The needle on a compass moves and aligns with the magnetic field of Earth because the needle Is magnetized. A student is going to try using a compass on their next family hiking trip.



Which of the following actions would be most likely to affect the accuracy of the compass? (Choose 3)
Responses
A Moving the compass close to a magnetMoving the compass close to a magnet
B Holding the compass next to rocks containing ironHolding the compass next to rocks containing iron
C Crossing a river with the compass in a backpackCrossing a river with the compass in a backpack
D Holding the compass upside down for storageHolding the compass upside down for storage
E Walking under overhead power linesWalking under overhead power lines
F Painting the outside of the compass with nail polish

Answer 1

The actions that would be most likely to affect the accuracy of the compass are:

A. Moving the compass close to a magnet - This would directly interfere with the compass needle's alignment with the Earth's magnetic field.

B. Holding the compass next to rocks containing iron - Iron can create a local magnetic field that can disrupt the compass's readings.

E. Walking under overhead power lines - Power lines can generate electromagnetic fields that may affect the compass accuracy.

So, the correct choices are A, B, and E.