When a cell of e.m.f 3.06V is connected, the balance of a potentiometer is 75cm, Calculate the new balance of a cell of e.m.f  2.295V

King33Victor

2 weeks ago

for potentiometer, the formula below can be used

solution
data given:
E1 = 3.06V
E2 = 2.295V
L1 = 75cm
L2 = ??.

recall:

E1/E2 = L1/L2. or
E1/L1 = E2/L2.
which ever one u prefer.
but let's use the first
E1/E2 = L1/L2
3.06/2.295 = 75/L2
cross and multiply ❌
3.06L2 = 2.295x75
3.06L2 = 172.125
divide both sides by 3.06
3.06L2/3.06 = 172.125/3.06
L2 = 56.25cm
so oo option A is very legit 💯.

if u were asked to calculate for whetstone bridge, kindly use the formula

R1/R2 = R3/R4.