Question

In a meter bridge, the null point is found at a distance of 40 cm from A. If a resistance of 12ohm is connected in parallel with S, the null point occurs at 50 cm from A. Determine the values of R and S.

Plz....Answer fast.... it's urgent....
I will mark ur answer as brainliest.....​

Answer 1

Answer:

When 12Ω resistance is not connected in parallel to S than we can write,

R=S

100−l

1

l

1

l

1

=40cm

∴R=S(

60

40

)=

3

2

S __(I)

Now when 12Ω is connected in parallel to S, then

The effective resistance can be written as

S

1

1

=

S

1

+

12

1

=

12S

12+5

⇒S

1

=

(12+5)

12S

Now we can write

R=S

100−l

′

l

′

⇒l

′

=50cm

i.e. R=

(12+5)

12S

×

50

50

=

12+5

12S

__(II)

Using eq (II) and (I)

3

2

S=

12+5

12S

⇒(12+5)2=36

⇒24+25=36⇒25=12⇒S=6Ω

and R=

3

2

×6=4Ω

Answer 2

Answer:

values of RandS is R=29pS=50v