Home
Class 12
PHYSICS
In a meter bridge , the balancing len...

In a meter bridge , the balancing length from left end ( standard resistance of one ohm is in the right gap ) is found to be 20 cm . The value of the unknow resistance is .

A

`0.8 Omega`

B

`0.5 Omega`

C

`0.4 Omega`

D

`0.25 Omega`

Text Solution

Verified by Experts

The correct Answer is:
D

`R/S = 20/(100 - 20) rArr R/1 = 20/80 rArr R = 0.25 Omega`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise ASSERTION AND REASON|26 Videos

  • CURRENT ELECTRICITY

    ERRORLESS|Exercise NCERT BASED QUESTIONS (HEATING EFFECT OF CURRENT)|67 Videos

  • ATOMIC AND NUCLEAR PHYSICS

    ERRORLESS|Exercise Assertion and Reason|23 Videos

  • ELECTROMAGNETIC INDUCTION

    ERRORLESS|Exercise ASSERTION & REASON|20 Videos

Similar Questions

Explore conceptually related problems

In a metere bridge, the balance length from left end (standard resistance of 1Omega is in the right gap) is found to be 20 cm, the length of resistance wire in left gap) is found to be 20 cm the length of resistance wire in left gap is (1)/(2) m and radius is 2mm its specific resistance is

In a metre bridge experiment, the balancing length from the left end is found to be 20 cm. If a standard resistance of 20 ohm is kept in the right gap, then the value of the unknown resistance in the left gap is

In a metre bridge , the balancing length from the left end is found to be 40cm, when a known resistance of 3Omega is placed in the right gap, then the value of unknown resistance is

In meter bridge , the balancing length from left is found to be 20 cm when standard connected of 1 Omega is in right gap . The value of unknown resistance is

In the metre-bridge experiment with uknown resistance X in the left gap and a known resistance of 60Omega in the right gap, null point is obtained at l cm from left. If the unknown resistance X is shunted by an equal resistance, what should be the value of the known resistance in the right gap in order to get the null point at the same position?.

An unknown resistance is placed in the left gap and resistance of 50 ohm is placed in the right gap of a meter bridge . The null point is obtained at 40 cm from the left end. Determine the unknown resistance.

An unknown resistance is connected in a left gap of a metre bridge . The balance point is obtained when a resistance of 10 Omega is taken out from the resistance box in the right gap. On increasing the resistance from the resistance box by 12.5 Omega the balance point shifts by 20 cm. find the unknown resistance.

In a meter-bridge experiment with a resistance R_(1) in left gap and a resistance X in a right gap. null point is obtained at 40 cm from the left emf. With a resistance R_(2) in the left gap, the null point is obtainned at 50 cm from left hand. Find the position of the left gap is containing R_(1) and R_(2) (i) in series and (ii) in parallel.

ERRORLESS-CURRENT ELECTRICITY-PAST YEARS QUESTIONS
  1. A cell having an emf E and internal resistance r is connected across a...

    Text Solution

    |

  2. The resistance of the four arms P, Q, R and S in a Wheatstone's bridg...

    Text Solution

    |

  3. In a meter bridge , the balancing length from left end ( standard ...

    Text Solution

    |

  4. A galvanometer having a coil resistance of 60 Omega shows full scale...

    Text Solution

    |

  5. The resistance of 1 A ammeter is 0.018 Omega . To convert it into 10 ...

    Text Solution

    |

  6. A circuit contains an ammeter, a battery of 30 V and a resistance 40.8...

    Text Solution

    |

  7. A milli voltmeter of 25 milli volt range is to be converted into an am...

    Text Solution

    |

  8. A galvanometer of resistance 50Omega is connected to a b attery of 3V ...

    Text Solution

    |

  9. If voltage across a bulb rated 22 volt 100 watt drops by 2.5% of its r...

    Text Solution

    |

  10. A potentiometer circuit is setup as shown. The potential gradient acro...

    Text Solution

    |

  11. A potentiometer circuit has been set up for finding the internal r...

    Text Solution

    |

  12. A potentiometer wire of Length L and a resistance r are connected in s...

    Text Solution

    |

  13. A potentiometer wire is 100 cm long hand a constant potential differen...

    Text Solution

    |

  14. A potentiometer is an accurate and versatile device to make electrical...

    Text Solution

    |

  15. In the circuits shown below, the readings of the voltmeters and the am...

    Text Solution

    |

  16. Two electric bulbs, one of 200 volt 40 watt and the other 200 volt 100...

    Text Solution

    |

  17. A current of 3 A flows through the 2 Omega resistor as shown in the ci...

    Text Solution

    |

  18. The total power dissipated in watts in the circuit shown here is

    Text Solution

    |

  19. A battery of e.m.f. 10 V and internal resistance 0.5 ohm is connected ...

    Text Solution

    |

  20. Power dissipated across the 8 Omega in the circuit shown here is 2 W. ...

    Text Solution

    |