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# Physics questions 3 and 5

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9 ELECTRIC MOTOR & GENERATOR 9 ELECTRIC MOTOR & GENERATOR 9 If the resistance in the circuit is 325 ohms wh...
1. A magnetic field (B=3.2x10...3 T) passes perpendicular through a circular loop ofwire (radius = 5.0 cm). What
is the magnetic ﬂux through the loop?
Screen Shot
2022-01...6.12 PM
2. A circular coil (200 turn radius of6.0 cm] is rotated in a uniform magnetic field (B = 3.6x10..... T) At t = 0 the
coil is perpendicular to the ﬁeld and at t = 0.0155 the coil is parallel to the ﬁeld what is the average emf induced
in the coil?
square loop of wire with an area of 2.5x10.... mg is perpendicular to a uniform magnetic field (B = 2.2x10...z GeForce NOW
fthe square collapsed to an area of essentially 0 mg in a time of0.100 s as shown in the diagram what is the
average induced emfas it is collapsed and what is the direction of the induced current? [Remember to use
conventional current]
X X X X X
Screen Shot ’
3} (£4
2022-01...6.13 AM
4. Find the average emfinduced in a circular coil [50 turns radius of0.0 m) ifthe magnetic ﬂux through the
loops is changing at a rate of 15.0 Wb/s?
5. A square coil [100 turns area of each square loop = 4.0x10..._;mz] is perpendicular to a uniform magnetic
field. When the coil is rotated through 90.. in 0.12 s, the average induced emfis 0.92 V. What is the magnetic
field strength?
.
“a...
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.-v
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still!
6. A circular coil (10 turns, diameter = 25 cm) is placed perpendicular to a uniform magnetic field (B = 2.7 x 10. /
]. lfthe direction ofthe magnetic field is reversed in 0.305, what is the average emf induced in the coil?
magnet is quickly removed from a circular coil [25 turns, area = 5.0 x 10...} mg] changing the magnetic ‘
d within the coil at a rate of 0.40 T/s. What is the average emfinduced in the coil?
8. A square loop of wire (area: 7.2 x 10...; mg) has a resistance of12.0Q. Assume that the magnetic field drops
uniformly from 1.6 T to zero in 0.050 s as the loop is pulled from the magnetic field.