YASH CLASSES
7.ELECTRIC CURRENT
63. A wire of given material
having length l
and
resistance is 4Ω . What would
be the
resistance of
another wire of
the same
material having
length ½ and area
of
cross
section 2 A .
64. A wire of given material
having length 2 l
and
resistance is 8Ω . What would
be the
resistance of
another wire of
the same
material having
length ½ and area
of
cross
section 4 A .
65. A wire of given material
having length 5 l
and
resistance is 8Ω . What would
be the
resistance of
another wire of
the same
material
having length ¼ and
area of
cross
section 3 A .
66. A wire of given material
having length 2.5 l
and
resistance is 10Ω . What would
be the
resistance of
another wire of
the same
material having
length 2/3 and area
of
cross
section 4A .
67. A wire of given
material having length 8 l
and
resistance is 2Ω . What would
be the
resistance of
another wire of
the same
material having
length 2 and area
of
cross
section 8A .
68. A piece
of wire is drawn
by pulling it until
its
length is double.
Compare the new
resistance with
original .