Ocean Potentials The ocean is salty because it contains many dissolved ions. As
ID: 1424427 • Letter: O
Question
Ocean Potentials
The ocean is salty because it contains many dissolved ions. As these charged particles move with the water in strong ocean currents, they feel a force from the earth’s magnetic field. Positive and negative charges are separated until an electric field develops that balances this magnetic force. This field produces measurable potential differences that can be monitored by ocean researchers. The Gulf Stream moves northward off the east coast of the United States at a speed of up to 3.5 m/s. Assume that the current flows at this maximum speed and that the earth’s field is 50 T tipped 60° below horizontal.
Part A
What is the direction of the magnetic force on a singly ionized negative chlorine ion moving in this ocean current?
A) East
B) West
C) Up
D) Down
Part B
What is the magnitude of the force on this ion?
Part B
What is the magnitude of the force on this ion?
What is the magnitude of the force on this ion?
Part C
What magnitude electric field is necessary to exactly balance this magnetic force?
What magnitude electric field is necessary to exactly balance this magnetic force?
Part D
The electric field produces a potential difference. If you place one electrode 10 mbelow the surface of the water, you will measure the greatest potential difference if you place the second electrode
A) 2.8×1023N B) 2.4×1023N C) 1.6×1023N D) 1.4×1023NExplanation / Answer
A)
East
B)
F = q*v*B*sintheta
F = 1.6*10^-19*3.5*50*10^-6*sin60 = 2.4*10^-23 N
option B
(c)
E = F/q = 1.5*10^-4 N/C
option B
____________
part D
at the same depth 10 m to the east.
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