YASH CLASSES
3 MAGNETIC EFFECTS OF ELECTRIC CURRENT [ X ]
17. 1 Oersted =
(a)
103 (b) 102 (c)
104 (d) 105
18. An
electron enters a
magnetic field at
right
angles to it as shown
in fig.
the direction of the force
acting on
the electron
will be
(a) to the right (b) to the left
(c)
into the page
(d) out of
the page
19. Which
of the following
property of a
proton
can change while
it mass freely
magnetic field
?
(a)
mass (b) speed
(c)
velocity (d)
momentum
20. A
positively charged particle
projected
toward
west is deflected
towards north
by
magnetic field .The direction
of
magnetic field
is
(a)
towards south (b)
towards east
(c)
downwards (d) upwards
21. A
rectangular coil of
wires is rotated
in
a
magnetic field . the
direction of the
induce
current changes once
in each
(a)
two
revolutions (b) one revolution
(c) half
revolution (d) one forth revolution
22. Uses of
(a) Ammeter (b) voltmeter
(c)
galvanometer
23. What is an electric generator or dynamo ?