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JEE Advanced 2020 Full Test 7 Paper 1
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© examsnet.com
Question : 2
Total: 54
The figure shows a long fixed wire AB carrying constant current I Another wire XY parallel to AB of mass per unit length
λ
is kept at a distance
r
from wire AB connected to a capacitor of capacitance C by flexible light wires through a switch. The capacitor is initially charged to voltage
E
0
. The switch is closed at
t
=
0
and the circuit has a negligible. The velocity of the wire
X
Y
, just after closing the switch will be
µ
0
∕
C
E
0
4
π
r
λ
µ
0
∕
C
E
0
2
π
r
λ
+
L
µ
0
∕
C
µ
0
∕
C
E
0
2
π
r
λ
µ
0
∕
C
E
0
4
π
r
+
L
µ
0
∕
C
Validate
Solution:
V
=
∫
F
d
t
m
=
∫
i
L
B
d
t
m
© examsnet.com
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