A null point is found at 200 cm in potentiometer when cell in secondary circuit is shunted by 5 . When a resistance of 15 is used for shunting null point moves to 300 cm. The internal resistance of the cell is ______ . [2023]

STUDY MATERIALS
COURSES
MORE
SUCCESS STORY
ADMISSION
STORE

Back

JEE ADVANCE

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

JEE MAIN

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

NEET

CLASS XI - XII
CRASH COURSE

CLASS XI - XII

CRASH COURSE

BITSAT

CLASS XI - XII

CLASS XI - XII

CBSE BOARD

CLASS IX

CLASS X

CLASS XI

CLASS XII

CLASS VI

CLASS VII

CLASS VIII

UP BOARD

CLASS IX
CLASS X
CLASS XI
CLASS XII

CLASS IX

CLASS X

CLASS XI

CLASS XII

CUET

CRASH COURSE

CRASH COURSE

Courses

CLASSROOM COURSES
ONLINE COURSES

ONLINE COURSES

More

Solution

Q.
A null point is found at 200 cm in potentiometer when cell in secondary circuit is shunted by 5 $Ω$ . When a resistance of 15 $Ω$ is used for shunting null point moves to 300 cm. The internal resistance of the cell is ______ $Ω$ . [2023]

Ans.
(5)

$\frac{ε}{r + 5} \times 5 = 200 x$ ....(i)

$\frac{ε \times 15}{r + 15} = 300 x$ ...(ii)

$\Rightarrow r = 5 Ω$

Want Us to Email you About Special Offers & Updates?