B2-0:
A current-carrying wire is in a B-field. The wire is parallel to the
B-field as shown. What is the direction of the magnetic force on
the wire?
A) right B) left C) up D) down E) None of
these.
`
B
I
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Magnetic Field Tests: Identifying Magnetic Forces and Fields, Assignments of Physics
This document consists of various multiple-choice questions related to magnetic fields and magnetic forces acting on current-carrying wires and loops. Topics include magnetic fields due to currents, magnetic forces on wires, and the relationship between current and magnetic fields.
Typology: Assignments
Pre 2010
1 / 9
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B2-0:
A current-carrying wire is in a B-field. The wire is parallel to the
B-field as shown. What is the direction of the magnetic force on
the wire?
A) right B) left C) up D) down E) None of
these.
`
B
I
More B-field Concept Tests B2- 1
Which point A or B has the larger magnetic field?
A B
C : The B-field is the same at A and B.
B2- 2
A long straight wire is carrying current I. The magnetic field at
point x has magnitude Btotal.
True (A) or False (B): The magnetic field
B 1 / 2 at point x due only
to the current to the left of x points in the same direction and has
1/2 the magnitude of
Btotal.
I
B1/2 =?
r x r Btotal A B
I
I
B2- 4 A long straight copper wire has radius b and carries a constant current
of magnitude I. The current density of magnitude J=I/(b 2 ) is uniform throughout the wire. What is the current contained in the circular loop £, with radius r < b, centered on the wire's center as shown? A: r b
I
F
H
G
I
K
J B:
r b
I
F
H
G
I
K
J
2 C: r b
I
F
H
G
I
K
J
3 D: None of these How does the magnitude of the B-field a distance r < b from the center of the wire depend on r? A: B r B: B = constant C: B 1/r D: B 1/r^2 E: None of these/don't know. Referring to the same wire, for the new loop £ shown below, what is the value of L
ò B^ ×d
r r
Ñ l?
A: +I/
B: > I/
C: < I/
b r J = constant b J = constant
B2-0b
How do the two angles and in the diagram below compare?
A) = B) = + 90
o
C) =
D) =
E) None of these!
I
x x
dl
r
B2- 6 A magnetic compass is placed at the points A, B, and C near an
electric circuit which has the following twisty shape: The deflection of the compass needle is a measure of the strength of the magnetic field. The relative deflection of the needle n order from biggest to smallest deflection is.. A: ABC B: CBA C: BCA D: ACB E: None of these.
B2- 7 A permanent bar magnet is broken in half. The two pieces are
interchanged, keeping their orientations fixed, as shown below. Do the pieces attract or repel? A: Attract B: Repel C: Neither! There is no net force. A B C 1 2 2 1
B2- 8 A row of positive charges is stationary on the ground. A person with a
gauss-meter(which measures the magnetic field) is running to the right along the row of charges, at the same height as the charges and in front of them (in the diagram below). What is the direction of the B-field which the observer measures?
- +^ + + + + + Green(down) Blue Pink(up) Yellow Purple: Zero (backward (forward direction) direction)