Home
Class 12
PHYSICS
To locate null point deflection battery ...

To locate null point deflection battery key `(K_1)` ios pressed before the galvanometer `(K_2)` Explanation why?

Text Solution

Verified by Experts

If galvanomketer key `K_2` is pressed first then just after closing the battery key `K_1` current suddenly increases.
So, due to self induction a large back emf is generated in the galvanometer, which may damage the galvanometer.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Example Type 1|2 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Example Type 2|1 Videos

  • COMMUNICATION SYSTEM

    DC PANDEY|Exercise Subjective|11 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Medical entrances gallery|25 Videos

Similar Questions

Explore conceptually related problems

To locate null point, deflection battery key K_(1) is pressed before the galvanometer key K_(2) . Explain why?

the galvameter deflection , when key K_(1) is clossed but K_(2) is open equals theta_(0) (see figure ) On clossing k_(2) also and adjusting R_(2) to 5Omega , the deflection in galvanometer becomes (theta_(0))/(5) the resistnce of the galvanometer is then , given by [Neglect the internal resistance of battery]:

The Wheatstone's network is shown in the figure. If the key K is closed, then the galvanometer will

In the following Wheatstone bridge P//Q = R//S . If key K is closed, then the galvanometer will show deflection

The resistances P,Q,R and S in the bridge shown are adjusted such that the deflection in the galvanometer G is zero when both the keys K_(1) and K_(2) are inserted. The galvanometer will show a momentary deflection if

In the arrangement shown in figure when the switch S_2 is open, the galvanometer shown no deflection for l=L//2 . When the switch S_2 is closed, the galvanometer shown no deflection for l=5L//12 . The internal resistance (r) of 6V cell, and the emf E of the other battery are respectively

In the given circuit, calculate the ratio of currents through the battery if (1) Key K_(1) is pressed, K_(2) open and then (2) Key K_(2) is pressed, key K_(1) is opened

In the given circuit of potentiometer, the potential difference E across AB (10m length) is larger than E_(1) and E_(2) as well. For key K_(1) (closed), the jockey is adjusted to touch the wire at point J_(1) so that there is no deflection in the galvanometer. Now the first battery (E_(1)) is replaced by second battery (E_(2)) for working by making K_(1) open and K_(2) closed. The galvanometer gives then null deflection at J_(2) The value of (E_(1))/(E_(2)) is (a)/(b) where a=____.

A galvanometer of resistance 5 Omega is connected in series with a resistance of 0.2Omega to a battery of negligible internal resistance. The deflection is noted. If the 0.2Omega resistance is replaced by 2 Omega resistance, the value of shunt resistance to be connected to the galvanometer to maintain the same deflection is

DC PANDEY-CURRENT ELECTRICITY-Medical entrances gallery
  1. To locate null point deflection battery key (K1) ios pressed before th...

    Text Solution

    |

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

    Text Solution

    |

  3. The charge flowing through a resistance R varies with time t as Q = at...

    Text Solution

    |

  4. The potential difference (V(A) - V(B)) between the point A and B in th...

    Text Solution

    |

  5. A filament bulb (500 W, 100 V) is to be used in a 230 V main supply. W...

    Text Solution

    |

  6. A potentiometer wire has length 4 m and resistance 8 Omega. The resist...

    Text Solution

    |

  7. A, B and C are voltmeters of resistances R, 1.5R and 3R respectively. ...

    Text Solution

    |

  8. A cross a metallic conductor of non-uniform cross-section, a constant ...

    Text Solution

    |

  9. Consider the diagram shown below. A Voltmeter of resistance 150 O...

    Text Solution

    |

  10. Each resistor shown in the figure has a resistance of 10 Omega and the...

    Text Solution

    |

  11. A 1 Omega resistance in series with an ammeter is balanced by 25 cm of...

    Text Solution

    |

  12. The range of voltmeter is 10 V and its internal resistance is 50 Omega...

    Text Solution

    |

  13. Identify the wrong statement.

    Text Solution

    |

  14. When the rate of flow of charge through a metallic condoctor of non-un...

    Text Solution

    |

  15. The resistance of a carbon resistor of colour code Red-Red Green Silve...

    Text Solution

    |

  16. The slope of the graph showing the variation of potential difference V...

    Text Solution

    |

  17. Two wires of the same dimensions but resistivities rho(1) and rho(2) a...

    Text Solution

    |

  18. A galvanometer of resistance 50 Omega is connected to a battery of 8 V...

    Text Solution

    |

  19. Choose the correct statement.

    Text Solution

    |

  20. A metal plate weighting 750g is to be electroplated wiwth 0.05% of it...

    Text Solution

    |

  21. A DC ammeter has resistance 0.1 Omega and its current ranges 0-100 A. ...

    Text Solution

    |