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Physics 10 Chapter 15 - Electromagnetism - 5
1.
What is the angle between the force acting on the conductor and the direction of current?
a) 45
o
b) 60
o
c) 90
o
d) 180
o
2.
If instead of a straight conductor, we place a current-carrying loop inside the magnetic field, the loop will rotate due to the .............acting on the coil?
a) Momentum
b) Torque
c) Moment arm
d) Couple
3.
What do the two forces which are equal in magnitude but opposite in direction form?
a) Momentum
b) Moment arm
c) Couple
d) Torque
4.
If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire.................?
a) Will be zero
b) Remains the same
c) Increases
d) Decreases
5.
What is the ring called that is split into two halves?
a) Split ring brushes
b) Ring commutator
c) Split ring commutator
d) Ring brushes
6.
With which the brushes of D.C motor are made of?
a) Copper
b) Aluminium
c) Graphite
d) Tungsten
7.
Which part of a D.C. motor reverses the direction of current through the coil every half-cycle?
a) Brushes
b) Armature
c) Commutator
d) Slip rings
8.
Which part of dc motor reverses the direction of current in the loop?
a) Changing brushes
b) Changing armature
c) Changing slip rings
d) Changing commutator
9.
What is the machine called that converts electric energy into rotational kinetic energy?
a) Diode
b) Capacitor
c) A.C generator
d) Electric motor
10.
The simple coil placed in a magnet cannot rotate more than......................?
a) 30°
b) 90°
c) 60°
d) 45°
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