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# Download The diagram shows a rigidly-clamped straight horizontal current

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```(ii)
The satellite has an external metal rod pointing towards the centre of the Earth.
Calculate the angle between the direction of the resultant magnetic field and the rod.
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(iii)
Explain why an emf is induced in the rod in this position.
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(4)
(Total 7 marks)
13
(a)
Complete the table of quantities related to fields. In the second column, write an SI unit for
each quantity. In the third column indicate whether the quantity is a scalar or a vector.
quantity
SI unit
scalar or vector
gravitational potential
electric field strength
magnetic flux density
(3)
(b)
(i)
A charged particle is held in equilibrium by the force resulting from a vertical electric
field. The mass of the particle is 4.3 Ã 10â9 kg and it carries a charge of magnitude
3.2 Ã 10â12 C. Calculate the strength of the electric field.
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(ii)
If the electric field acts upwards, state the sign of the charge carried by the particle
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(3)
(Total 6 marks)
Page 10 of 34
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