The Earth has a magnetic field. In which hemisphere is the Earth\'s magnetic Nor

Question

The Earth has a magnetic field. In which hemisphere is the Earth's magnetic North Pole located (at the moment, at least)? [ ] southern hemisphere [ ] northern hemisphere In Massachusetts, the Earth's magnetic field has a component that points [ ] vertically downwards [ ] vertically upwards [ ] there is no vertical component. For the anaerobic bacterium in Massachusetts to swim away from an oxygen rich environment, should it swim in the direction of the magnetic field, or in a direction opposite to the magnetic field? [ ] in the direction of the field [ ] opposite in direction to the field If the Massachusetts anaerobic bacteria are taken to a pond in Brazil, what do you suppose will happen to them? [Apart from being fingerprinted on entry at the airport, we mean!] Closely related species of these bacteria are also found all over the world. If you are given an unmarked vial containing Brazilian bacteria, and another unmarked vial containing Massachusetts bacteria, and you have access only to a microscope and a bar magnet with the poles clearly marked, can you identify which is which? If so, how?

Explanation / Answer

Solution:

a) Northern Hemisphere.

b) Vertically upwards.

c) These organisms are called magnetotactic bacteria and move in the direction of magnetic North.

d) They move in the opposite direction to the direction of motion in massachussetts since the field is oppositely directed in the southern and northern hemispheres.

They move in the direction of the field.

d)

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