65. A circular plane sheet of radius 10 cm is placed in
a uniform electric field of 5 x 10NCmaking an
angle of 60° with the field. The electric flux through
the sheet is
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Here, r=10cm=0.1m,E=5×10
5
NC
−1
AS the angle between the pane sheet and the electric field is 60
o
, angle made by the normal to the plane sheet and the electric field is
θ=90
o
−60
o
=30
o
ϕ
E
=EScosθ
=E×πr
2
cosθ
=5×10
5
×3.14×(0.1)
2
cos30
o
=1.36×10
4
Nm
2
C
−1
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