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Magnetic Effect of Electric Current - 04
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Q.1. In an electric motor, the direction of current in the coil changes once in each :
*
1 point
one rotation
two rotations
half rotation
one-fourth rotation
Q.2. The force experienced by a current-carrying conductor placed in a magnetic field is the largest when the angle between the conductor and the magnetic field is :
*
1 point
45°
90°
180°
60°
Other:
Q.3. The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is :
*
1 point
90°
60°
45°
180°
Q.4. An electric motor is a device which transforms :
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1 point
mechanical energy to electrical energy
electrical energy to mechanical energy
heat energy to electrical energy
electrical energy to heat energy only
Q.5. A magnetic field exerts no force on :
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1 point
an unmagnetized iron bar
a stationary electric charge
a magnet
an electric charge moving perpendicular to its direction
Q.6. A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each :
*
1 point
one-fourth revolution
half revolution
two revolutions
one revolution
Q.7. The phenomenon of electromagnetic induction is :
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1 point
the process of rotating a coil of an electric motor.
the process of charging a body.
producing induced current in a coil due to relative motion between a magnet and the coil.
the process of generating magnetic field due to a current passing through a coil.
Q.8. The device used for producing electric current is called a :
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1 point
motor
generator
galvanometer
ammeter
Q.9. The essential difference between an AC generator and a DC generator is that :
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1 point
AC generator has an electromagnet while a DC generator has permanent magnet.
DC generator will generate a higher voltage.
AC generator has slip rings while the DC generator has a commutator
AC generator will generate a higher voltage.
Q.10. Each one of the following changes will increase emf (or voltage) in a simple generator except :
*
1 point
increasing the speed of rotation
winding the coil on a soft iron armature
increasing the size of the gap in which the armature turns
increasing the number of turns in the armature coil
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