Q: A small object with charge $$4.00 \times 10$$^{-6}$$\ \mathrm{C} is $$traversing to the right between two parallel plates. The region between the plates has a uniform magnetic field $$B = 0.07\ \mathrm{T}$$ into the page. If the object moves in a straight line, what is the magnitude and direction of the electric field between the plates?

$$1.5 \times 10^4$\ \mathrm{V/m}$$, toward the lower plate

Q: A small object with mass $$8.00 \times 10$$^{-6}$$\ \mathrm{kg}$$ and charge $$q$$ enters a region of uniform magnetic field with magnitude $$B = 0.40\ \mathrm{T}$$ and direction into the page. If the object is traveling with a velocity of $$3.00 \times 10^3$\ \mathrm{m/s}$$ and exits the field region after traversing a distance of $$0.0800\ \mathrm{m}$$, what is the sign and magnitude of the charge of the object?

$$-4.0 \times 10$$^{-6}$$\ \mathrm{C}$$

Q: A long straight wire carries current $$I = 6.0\ \mathrm{A}$$ around the flat, as shown in the sketch. What are the magnitude and direction of the magnetic field produced by the wire at point P, which is $$0.0400\ \mathrm{m}$$ above the wire?

$$3.0 \times 10$$^{-5}$$\ \mathrm{T}$$, out of the page

Q: A toroidal coil with self-inductance of $$0.300\ \mathrm{H}$$ has a current increasing at a uniform rate of $$0.020\ \mathrm{A/s}. $$What is the magnitude of the induced emf in the inductor?

$$6.0 \times 10$$^{-3}$$\ \mathrm{V}$$

Q: A circular loop of wire with radius $$R = 0.20\ \mathrm{m}$$ carries a counterclockwise current $$I = 5.0\ \mathrm{A}. A $$long straight wire is $$0.10\ \mathrm{m}$$ from the center of the loop and carries current $$I = 5.0\ \mathrm{A}$$ upward. What are the magnitude and direction of the net magnetic field at the center of the loop?

$$2.5 \times 10$$^{-5}$$\ \mathrm{T}$$, out of the page

Question 1

A circuit consists of a 120 V battery, a 20 Ω resistor, and a 40 Ω resistor in series. What is the current through the 120 V emf?

Accepted Answer

$$2.4\ \mathrm{A}$$

Question 2

A small object with charge $$q = 5.00 	imes 10$$^{-6}$$\ \mathrm{C}$$ moves to the right with speed $$v = 2.00 	imes 10^5$\ \mathrm{m/s} in a $$region where there is a magnetic field $$B = 0.07\ \mathrm{T}$$ into the page. What are the magnitude and direction of the magnetic force on the object?

Accepted Answer

$$0.07\ \mathrm{N}$$, toward the bottom of the page

Question 3

A $$4.00 	imes 10$$^{-6}$$\ \mathrm{F}$$ capacitor is initially uncharged. It is connected in series with a $$900\ \Omega$$ resistor and an emf source with voltage $$300.0\ \mathrm{V}. $$Just after the circuit is completed, what is the current through the resistor?

Accepted Answer

$$0.44\ \mathrm{A}$$

Question 4

A small object with charge $$4.00 	imes 10$$^{-6}$$\ \mathrm{C} is $$traversing to the right between two parallel plates. The region between the plates has a uniform magnetic field $$B = 0.07\ \mathrm{T}$$ into the page. If the object moves in a straight line, what is the magnitude and direction of the electric field between the plates?

Accepted Answer

$$1.5 	imes 10^4$\ \mathrm{V/m}$$, toward the lower plate

Question 5

A small object with mass $$8.00 	imes 10$$^{-6}$$\ \mathrm{kg}$$ and charge $$q$$ enters a region of uniform magnetic field with magnitude $$B = 0.40\ \mathrm{T}$$ and direction into the page. If the object is traveling with a velocity of $$3.00 	imes 10^3$\ \mathrm{m/s}$$ and exits the field region after traversing a distance of $$0.0800\ \mathrm{m}$$, what is the sign and magnitude of the charge of the object?

Accepted Answer

$$-4.0 	imes 10$$^{-6}$$\ \mathrm{C}$$

Question 6

A long straight wire carries current $$I = 6.0\ \mathrm{A}$$ toward the right. What is the force (magnitude and direction) on a $$0.040\ \mathrm{m}$$ length section of the wire that is in a uniform magnetic field $$B = 2.0\ \mathrm{T}$$ and direction into the page?

Accepted Answer

$$0.48\ \mathrm{N}$$, toward the top of the page

Question 7

A circular loop of wire with radius $$r = 0.0800\ \mathrm{m} is in a $$uniform magnetic field $$B = 0.40\ \mathrm{T}$$ that is directed into the page. There is a clockwise current of $$5.0\ \mathrm{A} in $$the loop. What is the magnitude of the net force on the loop?

Accepted Answer

$$0.00\ \mathrm{N}$$

Question 8

A long straight wire carries current $$I = 6.0\ \mathrm{A}$$ around the flat, as shown in the sketch. What are the magnitude and direction of the magnetic field produced by the wire at point P, which is $$0.0400\ \mathrm{m}$$ above the wire?

Accepted Answer

$$3.0 	imes 10$$^{-5}$$\ \mathrm{T}$$, out of the page

Question 9

A long straight vertical current creates a field as shown in the sketch. What is the direction of the magnetic field inside the cylinder?

Accepted Answer

Into the page

Question 10

Two long straight wires carry current in the same direction, as shown in the sketch. What is the direction of the force that wire 2 exerts on wire 1?

Accepted Answer

Toward wire 2

Question 11

A $$2.00 	imes 10$$^{-6}$$\ \mathrm{F}$$ capacitor is charged so that there is a voltage of $$0.040\ \mathrm{V}$$ across its plates. During the subsequent oscillations, what is the maximum current in the loop?

Accepted Answer

$$0.0040\ \mathrm{A}$$

Question 12

A toroidal coil with self-inductance of $$0.300\ \mathrm{H}$$ has a current increasing at a uniform rate of $$0.020\ \mathrm{A/s}. $$What is the magnitude of the induced emf in the inductor?

Accepted Answer

$$6.0 	imes 10$$^{-3}$$\ \mathrm{V}$$

Question 13

A rectangular conducting loop is pulled through a uniform magnetic field $$B at $$constant velocity $$v. $$What is the direction of the induced current in the loop?

Accepted Answer

Clockwise

Question 14

In the circuit shown, the current through the $$6\ \Omega$$ resistor is $$6\ \mathrm{A}$$ downward, and the current through the $$3\ \Omega$$ resistor is $$4\ \mathrm{A}$$ upward. What is the resistance $$R if $$the voltage across it is $$48\ \mathrm{V}$$?

Accepted Answer

$$8\ \Omega$$

Question 15

A circular loop of wire with radius $$R = 0.20\ \mathrm{m}$$ carries a counterclockwise current $$I = 5.0\ \mathrm{A}. A $$long straight wire is $$0.10\ \mathrm{m}$$ from the center of the loop and carries current $$I = 5.0\ \mathrm{A}$$ upward. What are the magnitude and direction of the net magnetic field at the center of the loop?

Accepted Answer

$$2.5 	imes 10$$^{-5}$$\ \mathrm{T}$$, out of the page

Physics 202 Study Guide: Circuits, Magnetism, and Electromagnetic Concepts

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