Lesson 4.4 Homework
1.
A 500turn coil has an area of 5.5 cm
2.
If it is rotated in a uniform magnetic field of ).8 T, (i) what
frequency of rotation will generate an emf of 10 V in the coil? (ii) If the coil rotates at 60 Hz,
what is the induced emf?
2.
A 700turns rectangular coil of area 3 cm
2
rotates in a magnetic field of 9000 G.
(i) What
is the maximum emf generated when the coil rotates 60 times a second? (ii) What must
be the frequency of rotation to generate a maximum emf of 120 V?
3.
A 60W light bulb is plugged into 110V supply. Find (i) I
rms
, (ii) I
max
and (iii) the
maximum power dissipated in the bulb.
4.
A 60Hz generator producing a maximum emf of 12.0 V is connected across a 3.0
Ω
resistor. (i) What is the angular frequency
ϖ
of the current? (ii) Find
I
max
and
I
rms
in the
resistor. (iii) find P
max
and P
ave
dissipated in the resistor.
6.
What is the reactance of 1.0mH inductor at a frequency of (i) 60 Hz, (ii) 6 kHz?
7.
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 Spring '11
 George
 Physics, Work, Alternating Current, Frequency, Magnetic Field, Irms

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