A potentiometer contains a cell of emf EO, internal resistance ro, a series resistance Rs and a uniform wire of length L and resistance RO in its primary circuit. Its secondary circuit contains a cell of emf E and internal resistance. R. varies with time (t) according to R =R. (1+at) (aisa +ve constant). The speed of jockey to keep the galvanometer of secondary circuit remain undeflected is
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Answer:
Current in ABCD
I=
R
eq
V
=
r+r
1
V
potential difference across potentiometr =Ir
=
(r+r
1
)
Vr
Potential gradient =
L
V
=
(r+r
1
)
Vr
×
L
1
=k
we know that EMF=kl
l=balancing length
EMF=(
r+r
1
Vr
)
L
l
=(
r+r
1
ϵr
)
L
l
Answered by
1
Current in ABCD
I=
R
eq
V
=
r+r
1
V
potential difference across potentiometr =Ir
=
(r+r
1
)
Vr
Potential gradient =
L
V
=
(r+r
1
)
Vr
×
L
1
=k
we know that EMF=kl
l=balancing length
EMF=(
r+r
1
Vr
)
L
l
=(
r+r
1
ϵr
)
L
l
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