Question

In a physics laboratory experiment, a coil with 160 turns enclosing an area of 11.2 cm2 is rotated during the time interval 3.40×10⁻² s from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.00×10⁻⁵ T .

Part A

What is the total magnitude of the magnetic flux ( Φinitial) through the coil before it is rotated?

Express your answer numerically, in webers, to at least three significant figures.

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|Φinitial|

| Φ i n i t i a l |

=

6.72•10−8

Wb

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Part B

What is the magnitude of the total magnetic flux Φfinal through the coil after it is rotated?

Express your answer numerically, in webers, to at least three significant figures.

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|Φfinal|

| Φ f i n a l |

=

nothing

Wb

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Part C

What is the magnitude of the average emf induced in the coil?

Express your answer numerically (in volts) to at least three significant figures.

View Available Hint(s)

average induced emf =

nothing

V

Answer 1

Part A

= NBA (before it is rotated)

= 160 * 6e-5 * 11.2e-4

= 1.0752e-5 Wb

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Part B

parallel to field means no field lines are going through the loop

so,

= 0

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Part C

average emf induced

E = - / t

E = - ( 0 - 1.0752e-5) / 3.40e-2

E = 3.162e-4 V