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Transcript
Phys102
Term: 122
Online HW-Ch030-Lec01
Q1:
Faraday’s law states that an induced emf is proportional to:
A.
B.
C.
D.
E.
the rate of change of the magnetic field
the rate of change of the electric field
the rate of change of the magnetic flux
the rate of change of the electric flux
zero
Ans:
𝐂
Q2:
Suppose this page is perpendicular to a uniform magnetic field and the
magnetic flux through it is 5 Wb. If the page is turned by 300 around an edge
the flux through it will be:
Ans:
When the page is perpendicular to the magnetic field the flux is maximum
∅ = ∅0 cos(θ) = 5 cos(30) = 4.3 Wb
Q3:
A 10-turn conducting loop with a radius of 3.0 cm spins at 60 revolutions per second
in a magnetic field of 0.50T. The maximum emf generated is (5.3 V)
Ans:
ε=N
d(BAcos(θ))
d(cos(ωt))
= NBA
= NBAωsin(ωt).
dt
dt
For maximum emf sin(ωt) = 1
ε = NBAω = NBπr 2 2πf = 10 × 0.5 × 3.14 × (3 × 10−2 )2 × 2 × 3.14 × 60 = 5.3 V
KFUPM-Physics Department
1