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Byju's Answer
Standard XII
Physics
Friction and Vertical Circular Motion Problems
If μs,μk,μr...
Question
If
μ
s
,
μ
k
,
μ
r
are coefficients of static friction, sliding friction and rolling friction then
A
μ
s
<
μ
k
<
μ
r
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B
μ
k
<
μ
r
<
μ
s
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C
μ
r
<
μ
k
<
μ
s
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D
μ
r
=
μ
k
=
μ
s
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Solution
The correct option is
C
μ
r
<
μ
k
<
μ
s
A
s
w
e
k
n
o
w
f
k
=
k
i
n
e
c
t
i
c
f
r
i
c
t
i
o
n
o
r
s
l
i
d
i
n
g
f
r
i
c
t
i
o
n
f
s
=
s
t
a
t
i
c
f
r
i
c
t
i
o
n
f
r
=
r
o
l
l
i
n
g
f
r
i
c
t
i
o
n
f
r
<
f
k
<
f
s
H
e
n
c
e
μ
r
<
μ
k
<
μ
s
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Q.
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