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1 markMagnetic Fields

CAPE Physics Unit 2 · 2004 · Paper 1 · Question 2(a)(i)

Magnetic field due to a current-carrying wire.

Write down an expression for the magnetic field at a distance r metres from a long straight wire carrying a current of I amperes.

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Other parts of this question

  1. 2(a)(ii)State the shape formed by the magnetic field lines around a long straight current-carrying wire.[1 mark]
  2. 2(a)(iii)On Figure 2a, sketch the resultant magnetic field lines due to the interaction of the Earth's magnetic field and that of the wire, and indicate with an X the…[4 marks]
  3. 2(b)(i)Mark with a P the approximate region on Figure 2c where the resultant magnetic field is zero.[1 mark]
  4. 2(b)(ii)Calculate the distance of P from the wire carrying the current of 5 A.[3 marks]

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