In the experimental set up of metre bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 resistor is connected in series with R_{1}, the null point shifts by 10 cm. The resistance that should be connected in parallel with (R_{1} + 10) such that the null point shifts back to its initial position is

a. |
40 |
b. |
60 |

c. |
20 |
d. |
30 |

In the experimental set up of metre bridge shown in the figure, the null point is obtained at a distance of 40 cm from A. If a 10 resistor is connected in series with R_{1}, the null point shifts by 10 cm. The resistance that should be connected in parallel with (R_{1} + 10) such that the null point shifts back to its initial position is

a. |
40 |
b. |
60 |

c. |
20 |
d. |
30 |

1 Answer

127 votes

= …..(i)

= 1 ⇒ + 10 = ….. (ii)

+ 10 =

10 = ⇒ = 30

& = 20

=

R = 60

127 votes

127