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Standard XII
Physics
EMF and EMF Devices
E.M.F. ofa ce...
Question
E.M.F. ofa cell is expressed in
A
volt
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B
volt per metre
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C
volt metre
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D
none of these
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Solution
The correct option is
A
volt
E.m.f of a cell is defined as the maximum potential difference across the cell when no current flows through the circuit.
Hence e.m.f is expressed in volt
(
V
)
.
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Similar questions
Q.
A cell of e.m.f.
ε
and internal resistance
r
is used to send current to an external resistance
R
.
The expressions for the potential difference across the cell is :
Q.
Obtain an expression for e.m.f. induced in a coil rotating with uniform angular velocity in a uniform magnetic field. Show graphically the variation of e.m.f. with time
(
t
)
.
Resistance of a potentiometer wire is
0.1
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/
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. A cell of e.m.f.
1.5
V
is balanced at
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m
on this potentiometer wire. Calculate the current and balancing length for another cell of e.m.f.
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on the same potentiometer wire.
Q.
Two cells of e.m.f. 10
V
&
15
V
are connected in parallel to each other between points A
&
B
.The cell of e.m.f. 10
V
is ideal but the cell of e.m.f. 15
V
has internal resistance 1
Ω
. The equivalent e.m.f. between
A
and
B
is:
Q.
The e.m.f. of the cell is
Q.
The e.m.f. of the cell involving following changes,
Z
n
(
s
)
+
N
i
2
+
(
1
M
)
→
Z
n
2
+
(
1
M
)
+
N
i
(
s
)
is
0.5105
V
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The standard e.m.f. of the cell is:
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