A circular loop of wire is in aregion of spatially uniformmagnetic field. The magneticfield is directed into the plane ofthe figure. If the magnetic fieldmagnitude is constant,

Q29.1

A. the induced emf is clockwise.

B. the induced emf is counterclockwise.

C. the induced emf is zero.

D. The answer depends on the strength of the field.

A circular loop of wire is in aregion of spatially uniformmagnetic field. The magneticfield is directed into the plane ofthe figure. If the magnetic fieldmagnitude is constant,

A29.1

A. the induced emf is clockwise.

B. the induced emf is counterclockwise.

C. the induced emf is zero.

D. The answer depends on the strength of the field.

A circular loop of wire is in aregion of spatially uniformmagnetic field. The magneticfield is directed into the plane ofthe figure. If the magnetic fieldmagnitude is increasing,

Q29.2

A. the induced emf is clockwise.

B. the induced emf is counterclockwise.

C. the induced emf is zero.

D. The answer depends on the strength of the field.

A circular loop of wire is in aregion of spatially uniformmagnetic field. The magneticfield is directed into the plane ofthe figure. If the magnetic fieldmagnitude is increasing,

A29.2

A. the induced emf is clockwise.

B. the induced emf is counterclockwise.

C. the induced emf is zero.

D. The answer depends on the strength of the field.

A circular loop of wire is placednext to a long straight wire. Thecurrent I in the long straightwire is increasing. What currentdoes this induce in the circularloop?

Q29.3

A. a clockwise current

B. a counterclockwise current

C. zero current

D. not enough information given to decide

A circular loop of wire is placednext to a long straight wire. Thecurrent I in the long straightwire is increasing. What currentdoes this induce in the circularloop?

A29.3

A. a clockwise current

B. a counterclockwise current

C. zero current

D. not enough information given to decide

A circular loop of wire is placednext to a long straight wire. Thecurrent I in the long straightwire is increasing. The circularloop will be

Q29.4

A. attracted to the long wire

B. repelled away from the long wire

C. neither attract nor repel

D. not enough information given to decide

A circular loop of wire is placednext to a long straight wire. Thecurrent I in the long straightwire is increasing. The circularloop will be

A29.4

A. attracted to the long wire

B. repelled away from the long wire

C. neither attract nor repel

D. not enough information given to decide

A circular loop of wire is placednext to a long straight wire. Thecurrent I in the long straightwire is decreasing. The circularloop will be

Q29.5

A. attracted to the long wire and the induced currentis clockwise

B. repelled away from the long wire and the inducedcurrent is counterclockwise

C. attracted to the long wire and the induced currentis counterclockwise

D. repelled away from the long wire and the inducedcurrent is clockwise

A circular loop of wire is placednext to a long straight wire. Thecurrent I in the long straightwire is decreasing. The circularloop will be

A29.5

A. attracted to the long wire and the induced currentis clockwise

B. repelled away from the long wire and the inducedcurrent is counterclockwise

C. attracted to the long wire and the induced currentis counterclockwise

D. repelled away from the long wire and the inducedcurrent is clockwise

Q29.6

A. flows downward through resistor R and is proportional to B.

B. flows upward through resistor R and is proportional to B.

C. flows downward through resistor R and is proportional to B2.

D. flows upward through resistor R and is proportional to B2.

E. none of the above

A flexible loop of wire lies ina uniform magnetic field ofmagnitude B directed into theplane of the picture. The loopis pulled as shown, reducingits area. The induced current

A29.6

A. flows downward through resistor R and is proportional to B.

B. flows upward through resistor R and is proportional to B.

C. flows downward through resistor R and is proportional to B2.

D. flows upward through resistor R and is proportional to B2.

E. none of the above

A flexible loop of wire lies ina uniform magnetic field ofmagnitude B directed into theplane of the picture. The loopis pulled as shown, reducingits area. The induced current

The rectangular loop of wire is beingmoved to the right at constantvelocity. A constant current I flowsin the long straight wire in thedirection shown. The currentinduced in the loop is

Q29.7

A. clockwise and proportional to I.

B. counterclockwise and proportional to I.

C. clockwise and proportional to I2.

D. counterclockwise and proportional to I2.

E. zero.

The rectangular loop of wire is beingmoved to the right at constantvelocity. A constant current I flowsin the long straight wire in thedirection shown. The currentinduced in the loop is

A29.7

A. clockwise and proportional to I.

B. counterclockwise and proportional to I.

C. clockwise and proportional to I2.

D. counterclockwise and proportional to I2.

E. zero.

The loop of wire is being moved tothe right at constant velocity. Aconstant current I flows in the longstraight wire in the direction shown.The current induced in the loop is

Q29.8

A. clockwise and proportional to I.

B. counterclockwise and proportional to I.

C. clockwise and proportional to I2.

D. counterclockwise and proportional to I2.

E. zero.

The loop of wire is being moved tothe right at constant velocity. Aconstant current I flows in the longstraight wire in the direction shown.The current induced in the loop is

A29.8

A. clockwise and proportional to I.

B. counterclockwise and proportional to I.

C. clockwise and proportional to I2.

D. counterclockwise and proportional to I2.

E. zero.

The drawing shows the uniformmagnetic field inside a long, straightsolenoid. The field is directed into theplane of the drawing, and is increasing.

What is the direction of the electricforce on a positive point charge placedat point a?

Q29.9

A. to the left B. to the right

C. straight up D. straight down

E. misleading question — the electric force at this point is zero

The drawing shows the uniformmagnetic field inside a long, straightsolenoid. The field is directed into theplane of the drawing, and is increasing.

What is the direction of the electricforce on a positive point charge placedat point a?

A29.9

A. to the left B. to the right

C. straight up D. straight down

E. misleading question — the electric force at this point is zero

The drawing shows the uniformmagnetic field inside a long, straightsolenoid. The field is directed into theplane of the drawing, and is increasing.

What is the direction of the electricforce on a positive point charge placedat point b?

Q29.10

A. to the left B. to the right

C. straight up D. straight down

E. misleading question — the electric force at this point is zero

The drawing shows the uniformmagnetic field inside a long, straightsolenoid. The field is directed into theplane of the drawing, and is increasing.

What is the direction of the electricforce on a positive point charge placedat point b?

A29.10

A. to the left B. to the right

C. straight up D. straight down

E. misleading question — the electric force at this point is zero

The drawing shows the uniformmagnetic field inside a long, straightsolenoid. The field is directed into theplane of the drawing, and is increasing.

What is the direction of the electricforce on a positive point charge placedat point c (at the center of the solenoid)?

Q29.11

A. to the left B. to the right

C. straight up D. straight down

E. misleading question — the electric force at this point is zero

The drawing shows the uniformmagnetic field inside a long, straightsolenoid. The field is directed into theplane of the drawing, and is increasing.

What is the direction of the electricforce on a positive point charge placedat point c (at the center of the solenoid)?

A29.11

A. to the left B. to the right

C. straight up D. straight down

E. misleading question — the electric force at this point is zero