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2 marksElectromagnetic Induction

CAPE Physics Unit 2 · 2008 (Rest of Region) · Paper 2 · Question 4(c)(iii)

Figure 5 shows a circular coil of 150 turns and diameter 0.1 m rotating 25 times per second in a uniform magnetic field of 4.0 \times 10^{-4}\text{ T}. At t=0 the coil is aligned as shown.

State what difference it would make to the induced e.m.f. if the coil were fixed and the magnet rotated at the same rate and in the same direction.

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Other parts of this question

  1. 4(a)Define magnetic flux and state Lenz's law.[2 marks]
  2. 4(b)(i)Explain why the ring jumps into the air.[2 marks]
  3. 4(b)(ii)Describe and explain the motion of the ring, if any, when a slot is cut into the ring as shown in Figure 4(b).[2 marks]
  4. 4(c)(i)Calculate the total magnetic flux \Phi through the coil at time t = 0.[2 marks]
  5. 4(c)(ii)a)Given the rate of change of flux is 2\pi f \Phi \sin(2\pi f t), find the maximum instantaneous value of the induced e.m.f. in the coil.[3 marks]
  6. 4(c)(ii)b)Find the r.m.s. value of the e.m.f. induced in the coil.[2 marks]

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