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Moving Charges and Magnetism - 04
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Q1. Two thin, long, parallel wires, separated by a distance ‘d’ carry a current of ‘i’ A in the same direction. They will
*
1 point
b
a
c
d
Q2. A charge q is moving with a velocity v parallel to a magnetic field B. Force on the charge due to magnetic field is
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1 point
q v B
zero
q B/v
B v/q
Q3. A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v. The radius of the circular path described by it will be
*
1 point
mq / Bv
mv / Bq
Bq / mv
mB / qv
Q4. Cyclotron is used to accelerate
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1 point
negative ions
positive ions
neutrons
electrons
Q5. The magnetic dipole moment of a current loop is independent of
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1 point
magnetic field in which it is lying
current in the loop
number of turns
area of the loop
Q6. Magnetic dipole moment of a rectangular loop is
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1 point
inversely proportional to area of loop
perpendicular to plane of loop and porportional to area of loop
inversely proportional to current in loop
parallel to plane of loop and porportional to area of loop
Q7. If m is magnetic moment and B is the magnetic field, then the torque is given by
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1 point
d
c
b
a
Q8. The magnetic moment of a circular coil carrying current is
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1 point
directly proportional to the square of the length of the wire in the coil
inversely proportional to the square of the length of the wire in the coil
directly proportional to the length of the wire in the coil
inversely proportional to the length of the wire in the coil
Q9. To make the field radial in a moving coil galvanometer
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1 point
coil is wounded on aluminium frame
the number of turns in the coil is increased
poles are cylindrically cut
magnet is taken in the form of horse-shoe
Q10. The deflection in a moving coil galvanometer is
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1 point
directly proportional to the number of turns in the coil
directly proportional to the torsional constant
inversely proportional to the current flowing
inversely proportional to the area of the coil
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