Question

What is the value of unknown resistance R, If galvanometer shows null deflection in the given meter bridge set up?

• A. $97.50 \Omega$
• B. 105 $\Omega$
• C. 150 $\Omega$
• D. 110$\Omega$

Answer 1

Answer: (A)

$97.50 \Omega$

Answer 2

: For null deflection in meter bridge

$\therefore \frac { 65 } { \mathrm { R } _ { 1 } } = \frac { 40 } { 100 - 40 } = \frac { 40 } { 60 }$