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3 marksMagnetic Fields

CAPE Physics Unit 2 · 2006 · Paper 2 · Question 5(a)(ii)

Questions on magnetic fields, magnetic forces between conductors, and current balances.

Sketch the magnetic flux pattern due to a long straight wire carrying a current, and state the formula for the flux density, B, at a distance, r, from the wire.

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  1. 5(a)(i)Define 'magnetic flux density' and the 'tesla'.[2 marks]
  2. 5(a)(iii)Figure 5 shows two long parallel wires, both of length l, separated by a distance r, carrying currents I_1 and I_2 in opposite directions. Show that…[3 marks]
  3. 5(b)(i)Calculate the current through the wire.[4 marks]
  4. 5(b)(ii)The sensitivity of the balance is 0.1 \times 10^{-6}\text{ N}. Calculate the minimum current detectable using this balance.[2 marks]
  5. 5(c)(i)Calculate the minimum number of turns per unit length that must be used.[3 marks]
  6. 5(c)(ii)Calculate the total length of wire required.[3 marks]

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