Q13 · 2022 · Paper 1Complex familiar1 mark
QUESTION 13
A rectangular coil of 3000 turns and dimensions 0.1 m × 0.2 m is rotated in a uniform magnetic field of 2 mT. Calculate the minimum number of revolutions per second required to produce an average EMF of 6 V.
(A)
1
(B)
3
(C)
13
(D)
50
WORKED SOLUTION
1 markAnswer C
ANSWER
C
Worked solution
For a rotating coil, the average induced emf over a quarter-turn is proportional to . Thus , so the minimum whole-number rate is 13 rev s. Option C.
Selects option C.
Worked explanation by QCE Vault; correct option verified against the QCAA answer key.