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Moving Charges and Magnetism - 03
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Q1. Two free parallel wires carrying currents in the opposite directions
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1 point
do not attract each other
get rotated to be perpendicular to each other
attract each other
repel each other
Q2. Two parallel wires carrying currents in the same direction attract each other because of
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potential difference between them
magnetic forces between them
mutual inductance between them
electric forces between them
Q3. A wire is placed parallel to the lines of force in a magnetic field and a current flows in the wire. Then
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the wire will not experience any force at all
the wire will experience a force in a direction opposite to the field
it experiences a force in a direction perpendicular to lines of force
the wire will experience a force in the direction of the magnetic field
Q4. A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon
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value of the current
area ot the loop
shape of the loop
magnetic field
Q5. A charged particle moves through a magnetic field in a direction perpendicular to it. Then the
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velocity remains unchanged
speed of the particle remains unchanged
direction of the particle remains unchanged
acceleration remains unchanged
Q6. An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to
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c
d
b
a
Q7. A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic field B. The time taken by the particle to complete one revolution is
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d
a
b
c
Q8. In cyclotron the gyro radius is
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inversely proportional to momentum
proportional to momentum
inversely proportional to energy
proportional to energy
Q9. In cyclotron the resonance condition is
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the frequency of revolution of charged particle is equal to the frequency of A.C. voltage sources
the frequency of revolution of charged particle, frequency of A.C. source and frequency of magnetic field are equal
the frequency of revolution of charged particle is equal to the frequency of rotation of earth
the frequency of revolution of charged particle is equal to the frequency of applied magnetic field
Q10. A long solenoid has n turns per meter and current I A is flowing through it. The magnetic field within the solenoid is
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1 point
c
d
a
b
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