10 minutes maximum! Can you do it in 5? |
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1. Electrical potential Ve is given by the equation:- Which of these is the unit given for Ve?
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2. Which of these diagrams correctly shows the electric field pattern around a single negative charge like an electron?
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3. Which of these diagrams shows the electric field between 2 identical positive charges? (Only a few key field lines have been shown). |
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4. At the point directly in the centre of the two positive charges q shown in question 3, the distance from each charge is r. What is the electric field strength E and the electrical potential Ve? |
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5. Gravitational and electrical fields have 'equipotential surfaces'. These are always..
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6. The graph below shows how a quantity (x) varies with distance (r) from an object. In this graph x is inversely proportional to -r.
This could be a graph showing.... |
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7. A space ship is projected along the Moon's surface at high speed and then projected into space. It requires an escape velocity of v. To reach deep space from a moon with no atmosphere, the same mass but four times the radius will require a velocity of: |
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8. A body of mass m is in orbit at a distance r around a planet of mass M.
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9 & 10. The gravitational potential at the surface of the Moon is -2.8 MJ kg-1. | ||||||||||||||||||||||||
9. This means that if a 10 kg rock is lifted from the Moon's surface into space:
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10. To calculate the gravitational energy increase for this rock over a small height increase Δr, the formula required is: | ||||||||||||||||||||||||