Question

1
A potentiometer has uniform
potential gradient across it. Two
cells connected in series (i) to
support each other and (ii) to
oppose each other, are
balanced over 6 m and 2 m
respectively on the
potentiometer wire. The emfs
of the cells are in the ratio of: *
O 1:2
O 1:1
O 3:1
O 2:1​

Answer 1

Answer:

Answer:

• The emf's of the two cells are in the ratio 2:1.

To find:

• The emf's of the cells ratio=?

Solution:

If the two cells are connected in series,

Then,

i) Two support each other=E1+E2=6m

ii) Two oppose each other=E1-E2=2m

Now, Solve i & ii

⟹ 2E1=8m

⟹ E1=4m

Substitute The value of E1 in the equation,

⟹ E2+4m=6m

⟹ E2=2m

So,

EMF'S of the cells,

⟹ E1/E2=l1/l2

⟹ E1/E2=4/2

⟹ E1/E2=2/1

⟹ E1:E2=2:1