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1 markMagnetic Forces

CAPE Physics Unit 2 · 2007 · Paper 2 · Question 1(a)

An experiment investigates the magnetic field along the axis of a solenoid wound on a 5 cm square wooden former over a length of 32 cm. The field along an infinitely long solenoid is given by B = μ₀ n I. A circuit with a battery, ammeter, rheostat, and Hall probe with flux meter is used.

State why an ammeter and a rheostat were included in the solenoid circuit.

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Other parts of this question

  1. 1(b)Using the experimental data in Table 1 for a current of 0.94 A, plot a graph showing the variation of magnetic flux density B along the axis of the solenoid…[5 marks]
  2. 1(c)(i)State what conclusions can be drawn about the region over which the formula B = μ₀ n I is valid.[1 mark]
  3. 1(c)(ii)State what conclusion can be drawn about the magnetic field strength at the end of the solenoid.[1 mark]
  4. 1(d)Use the formula to calculate the total number of turns of wire in the solenoid.[2 marks]

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