Mastering Physics Solutions: Kirchhoff’s Rules and Applying Them

Mastering Physics Solutions: Kirchhoff’s Rules and Applying Them

On September 23, 2013, in Chapter 18: Basic Electric Circuits, by Mastering Physics Solutions

Part A = current
Part B = I2 + I3 – I1
Part C = I3 ⋅ R3 – I2 ⋅ R2
Part D = Vb – I1 ⋅ R1 – I3 ⋅ R3

The junction rule describes the conservation of which quantity? Note that this rule applies only to circuits that are in a steady state.
Apply the junction rule to the junction labeled with the number 1 (at the bottom of the resistor of resistance R2).
Apply the loop rule to loop 2 (the smaller loop on the right). Sum the voltage changes across each circuit element around this loop going in the direction of the arrow. Remember that the current meter is ideal.
Now apply the loop rule to loop 1 (the larger loop spanning the entire circuit). Sum the voltage changes across each circuit element around this loop going in the direction of the arrow.

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Mastering Physics Solutions: Finding Current by Changing Resistors

Mastering Physics Solutions: Finding Current by Changing Resistors

On March 7, 2013, in Chapter 18: Basic Electric Circuits, by Mastering Physics Solutions

Part A = 1.40 A Click to use the calculator/solver for this part of the problem

If the external resistance is then changed to R2 = 4.00 Ω, what is the value of the current I2 in the circuit?

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Mastering Physics Solutions: Kirchhoff’s Current Rule Ranking Task

Mastering Physics Solutions: Kirchhoff’s Current Rule Ranking Task

On March 6, 2013, in Chapter 18: Basic Electric Circuits, by Mastering Physics Solutions

Part A = A > (B = C)
Part B = C > (A = B)
Part C = D > A > (B = C)

Rank the resistors in the figure below (A to C) on the basis of the current that flows through them.
Rank the resistors in the figure below (A to C) on the basis of the current that flows through them.
Rank the resistors in the figure below (A to D) on the basis of the current that flows through them.

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Mastering Physics Solutions: Magnetic Force on a Bent Wire Conceptual Question

Mastering Physics Solutions: Magnetic Force on a Bent Wire Conceptual Question

On March 3, 2013, in Chapter 19: Magnetism, by Mastering Physics Solutions

Part A = +y
Part B = 0
Part C = +x
Part D = -y
Part E = 0
Part F = -y
Part G = -x

The bent wire circuit shown in the figure is in a region of space with a uniform magnetic field in the +z direction.
Determine the direction of the magnetic force along segment 1, which carries current in the -x direction.
Determine the direction of the magnetic force along segment 2, which carries current in the -z direction.
etc.

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Mastering Physics Solutions: Measuring the Potential of a Nonideal Battery

Mastering Physics Solutions: Measuring the Potential of a Nonideal Battery

On March 1, 2013, in Chapter 17: Electric Current and Resistance, by Mastering Physics Solutions

Part A = 88.4 V Click to use the calculator/solver for this part of the problem
Part B = 0.025641 V Click to use the calculator/solver for this part of the problem

A battery with EMF 90.0 V has internal resistance Rb = 8.48 Ω.

What is the reading Vv of a voltmeter having total resistance Rv = 475 Ω when it is placed across the terminals of the battery?
What is the maximum value that the ratio Rb / Rv may have if the percent error in the reading of the EMF of a battery is not to exceed 2.50%?

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Mastering Physics Solutions: Current Sheet

Mastering Physics Solutions: Current Sheet

On February 23, 2013, in Chapter 19: Magnetism, by Mastering Physics Solutions

Part A = See the screenshot

Consider an infinite sheet of parallel wires. The sheet lies in the xy plane. A current l runs in the -y direction through each wire. There are N/a wires per unit length in the x direction.

Write an expression for B(d),the magnetic field a distance d above the xy plane of the sheet.

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