1. You are a distance D from a wire carrying current. You then move to a distanc
ID: 1447489 • Letter: 1
Question
1. You are a distance D from a wire carrying current. You then move to a distance 2D. You now experience
A) twice the B field as before
B) half the B field as before
C) the same B field as before
D) four times the B field as before
E) one-fourth the B field as before
2 Magnetic fields exert forces on:
A) electric charges
B) moving electric charges
C) electric current
D) electric dipoles
3. What can you say about the direction of the magnetic field (B), the magnetic force (F) on charge, and the velocity (v) of a point charge?
A) F is perpendicular to both B and v
B) B is perpendicular to F and v
C) v is perpendicular to B and F
D) F is parallel to B
E) v is parallel to B
F) v is parallel to F
4. The right-hand-rule for magnetic force given in the text book has:
A) thumb is v, index finger is B, middle finger is F
B) thumb is B, index finger is F, middle finger is v
C) thumb is F, index finger is v, middle finger is B
D) thumb is v, index finger is F, middle finger is B
E) thumb is B, index finger is v, middle finger is F
F) thumb is F, index finger is B, middle finger is v
5. A charged particle in a uniform magnetic field:
A) accelerates in a straight line along the B field
B) moves in a straight line perpendicular to the B field
C) moves in a circle perpendicular to the B field
D) moves in a circle parallel to the B field
Explanation / Answer
1.
we know that
B = u0*I1/2*pi*D
B is inversly propotional with the distance so if we doubles the distance B will be half .
so the answer is
B) half the B field as before
2.
magnetic field exerts force on moving electric charge becuase a moving electric charge produces magnetic field.
answer is
B) moving electric charges
3.
we know that
F = q*(v x B)
from the above relation
A) F is perpendicular to both B and v
B) B is perpendicular to F and v
C) v is perpendicular to B and F
4.
in right hand rule
index finger points the direction of the charge's velocity v .
middle finger points the direction of the magnetic field B.
thumb points the direction of the magnetic force Fm.
answer is
C) thumb is F, index finger is v, middle finger is B.
5.
we know that
F = q (v x B )
when the velocity of charged partical is perpendicular to uniform magnetic field the charged particle moves in circular path in a plane perpendicular to B .
so A charged particle in a uniform magnetic field
C) moves in a circle perpendicular to the B field
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