phys quiz 2

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Cosumnes River College *

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360

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Physics

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Dec 6, 2023

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Question 1 4 / 4 pts Find the total resistance for the circuit below. Correct! 14,1 Ω 29.0 Ω 6.55 Ω 2.93 Ω Question 2 4 / 4 pts In the circuit below, what would the voltage be across R4?

Correct! 10 V 6.0 V 50 V 20 V Question 3 4 / 4 pts Find the resistance that must be placed in parallel with a 25.0 Ω galvanometer having a 50.0 µA sensitivity to allow it to be used as an ammeter with a 300-mA full-scale reading. Correct! 4.17x10 -3 Ω 6.28x10 -3 Ω 1.27x10 -3 Ω 8.63x10 -3 Ω

Question 4 4 / 4 pts The timing device in an automobile’s intermittent wiper system is based on an RC time constant and utilizes a 0.600 µF capacitor and a variable resistor. Over what range must be made to vary to achieve time constants from 2.00 to 15.0 s? 4.00 MΩ to 30.0 MΩ 0.300 µΩ to 0.0400 µΩ 0.250 µΩ to 0.0600 µΩ ct! 3.33 MΩ to 25.0 MΩ Question 5 4 / 4 pts Find how much time is required to discharge a 250 µF capacitor through a 500 Ω resistor down to 1.00% of its original voltage. 0.892 s 32.8 µs Correct! 0.576 s 15.6 µs Question 6 4 / 4 pts

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What is the maximum force on an aluminum rod with a 0.100 µC charge that you pass between the poles of a 1.50-T permanent magnet at a speed of 5.00 m/s? In what direction is the force? 3.40x10 -7 N Correct! 7.50x10 -7 N 13.8x10 -7 N 9.63x10 -7 N Question 7 4 / 4 pts A cosmic ray proton moving toward the Earth at 5.00 x 10 7 m/s experiences a magnetic force of 1.50 x 10 -16 What is the strength of the magnetic field if there is 60 degree angle between it and the proton’s velocity? 3.01 x 10 -5 T Correct! 2.17 x 10 -5 T 12.7 x 10 -5 T 8.23 x 10 -5 T Question 8 4 / 4 pts A proton moves at 7.50 x 10 7 m/s perpendicular to a magnetic field. The field causes the proton to travel in a circular path of radius 0.600 m. What is the field strength? Correct!

1.30 T 0.562 T 1.66 T 0.979 T Question 9 4 / 4 pts What is the force per meter on a lightning bolt at the equator that carries 30,000 A perpendicular to the Earth’s 3.00 x 10 -5 T field? 12.8 N/m 0.600 N/m 1.67 N/m Correct! 0.900 N/m Question 10 4 / 4 pts An MRI technician moves his hand from a region of very low magnetic field strength into an MRI scanner’s 4.00 T field with his fingers pointing in the direction of the field. Find the average emf induced in his wedding ring, given its diameter is 2.20 cm and assuming it takes 0.250 s to move it into the field. Correct! 6.08 mV

1.16 mV 3.04 mV 12.8 mV

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