Question 332: Current Electricity

Question

A potentiometer wire PQ of 1 m length is
connected to a standard cell E
1
. Another cell E
2
of emf 1.02 V is connected with a resistance ‘r’
and switch S (as shown in figure). With switch
S open, the null position is obtained at a
distance of 49 cm from Q. The potential
gradient in the potentiometer wire is :

Accepted Answer

Balancing length is measured from P
PQ = 1m
QJ = 49 cm
$$ 	herefore $$ PJ = 51 cm
Potential drop = Potential gradient($$\phi $$) $$ 	imes $$ length
$$ \Rightarrow $$ 1.02 = $$\phi $$ $$ 	imes $$ 51
$$ \Rightarrow $$ $$\phi $$ = 0.02 V/cm

Answer

0.04 V/cm

Answer

0.01 V/cm

Answer

0.02 V/cm

Answer

0.03 V/cm

Current Electricity

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