Wednesday, November 11, 2020

Mastering Physics Problem 30.22

 Background

Electricity is distributed from electrical substations to neighborhoods at 15000 V. This is a 60 Hz oscillating (AC) voltage. Neighborhood transformers, seen on utility poles, step this voltage down to the 120 V that is delivered to your house.




Part A

How many turns does the primary coil on the transformer have if the secondary coil has 130 turns?

Solution







Part B






Solution












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Mastering Physics Problem 30.11

 An equilateral triangle with a side length of 20 centimeters has a magnetic field oriented away from the observer passing through its left half.






Part A
What is the magnitude of the magnetic flux through the triangle?

Solution







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Mastering Physics Problem 30.3

 Background

A 9.00-cm-long wire is pulled along a U-shaped conducting rail in a perpendicular magnetic field. The total resistance of the wire and rail is 0.350 Ω. Pulling the wire at a steady speed of v = 4.00 m/s causes 4.50 W of power to be dissipated in the circuit.



Part A

How big is the pulling force?

Solution







Part B

What is the strength of the magnetic field?

Solution













 
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Mastering Physics Problem 30.19

 A rectangular wire loop is located over a vertical border between two regions with different magnetic fields, in a way that half of the loop lies in the left region and half – in the right region. Both halves of the loop are squares with a side length of a. Magnetic field in the left region has a magnitude of 2.0 tesla and is directed into the page. Magnetic field in the right region has a magnitude of 1.0 tesla and is directed out of the page.

Part A



Solution






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Mastering Physics Problem 30.22

  Background Part A How many turns does the primary coil on the transformer have if the secondary coil has 130 turns? Solution Part B Soluti...