The length of a potentiometer wire is 400 cm . Leclanche cell gets balanced against 150 cm length of the wire. What is the new balancing length, if the length of the wire is altered to 600 cm ?

Question

The length of a potentiometer wire is 400 cm . Leclanche cell gets balanced against 150 cm length of the wire. What is the new balancing length, if the length of the wire is altered to 600 cm ? (A) 225 cm (B) 300 cm (C) 250 cm (D) 200 cm

Tardigrade Admin · Accepted Answer

Since resistance of remains same in both cases xℓ = xâ²ℓ â² ((E/400))(150)= ((E/400))(ℓ â²) or ℓ â²= 225 cm

Q. The length of a potentiometer wire is $400 c m$ . Leclanche cell gets balanced against $150 c m$ length of the wire. What is the new balancing length, if the length of the wire is altered to $600 c m$ ?

$225 c m$

$300 c m$

$250 c m$

$200 c m$

Since resistance of remains same in both cases
$x ℓ = x' ℓ'$
$(\frac{E}{400}) (150) = (\frac{E}{400}) (ℓ^{'})$
or $ℓ^{'} = 225 c m$

Q. The length of a potentiometer wire is 400cm . Leclanche cell gets balanced against 150cm length of the wire. What is the new balancing length, if the length of the wire is altered to 600cm ?

225cm

300cm

250cm

200cm