Home
Class 12
PHYSICS
A battery of 20 cells (each having e.m.f...

A battery of 20 cells (each having e.m.f. 1.8V and internal resistance `0.1Omega` is charged by 220 volts and the charging current is 15A. Calculate the resistance to be put in the circuit.

A

4m/s

B

`10m/s^2`

C

`5m/s2`

D

`2sqrt2m/s^2`

Text Solution

Verified by Experts

The correct Answer is:
(D)
`a=("Net force on system")/("total mass of system")=(5g-mu(5g))/(5+5)=(50(1-0.2))/10=4m/s^2 a_cm=|(m_1veca_1+m_2veca_2)/(m_1+m_2)|=a/sqrt2=2sqrt2m//s`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    ALLEN|Exercise EXERCISE-III|26 Videos

  • CURRENT ELECTRICITY

    ALLEN|Exercise EXERCISE-IV A|32 Videos

  • CIRCULAR MOTION

    ALLEN|Exercise EXERCISE (J-A)|6 Videos

  • GEOMETRICAL OPTICS

    ALLEN|Exercise subjective|14 Videos

Similar Questions

Explore conceptually related problems

A cell of emf epsilon and internal resistance r is charged by a current I, then

A battery of six cells each of e.m.f. 2V and internal resistance 0.5Omega is being charged by D.C. mains of e.m.f. 220V by using an external resistance of 10Omega what will be the charging current.

A battery of six cells each of e.m.f . 2V and internal resistance 0.5Omega is being charged by D.C. mains of e.m.f. 220V by using an external resistance of 10Omega . What is the potential difference across the battery?

A series battery of six cells each of emf 2 V and internal resistance 0.5 Omega is charged by a 100 V dc supply. What resistance should be used in the charging circuit in order to limit the charging current to 8 A . Using this relation , obtain (a) the powwer supplied by the dc source, (b) the power dissipated as heat , and (c) the chemical energy stored in the battery in 15 min .

A battery of 10 cells each of e.m.f. E=1.5V and internal resistance 0.5Omega has 1 cell wrongly connected. It is being charged by 220V power supply with an external resistance of 47Omega in series. The potential difference across the battery.

A battery of four cells in series, each having an emf of 1.14 V and an internal resistance of 2Omega is to be used to charge a small 2 V accumulator of negligible internal resistance. What is the charging current?

Two cells having emf's of 10 V and 8 V, and internal resistance of 1Omega (each) are connected as shown with an external resistance of 8Omega Find the current flowing through the circuit.

In a potentiometer circuit, the emf of driver cell is 2V and internal resistance is 0.5 Omega . The potentiometer wire is 1m long . It is found that a cell of emf 1V and internal resistance 0.5 Omega is balanced against 60 cm length of the wire. Calculate the resistance of potentiometer wire.

A battery of emf 10 V and internal resistance 3 Omega is connected to a resistor. If the current in the circuit is 0.5 A, what is the resistance of the resistors ? What is the terminal voltage of the battery when the circuit is closed ?

A cell of e.m.f. 1.5 V, internal resistance 1 Omega is connected to the resistors of 4 Omega and 20 Omega in series. Draw a circuit diagram and calculate : the current in the circuit,

ALLEN-CURRENT ELECTRICITY-EX.II
  1. A battery of 20 cells (each having e.m.f. 1.8V and internal resistance...

    Text Solution

    |

  2. In the Bohr's model of hy drogen atom, the electron moves around the n...

    Text Solution

    |

  3. There are three copper wires of length and cross-sectional area (L,A),...

    Text Solution

    |

  4. When a piece of aliminium wire of finite length is drawn through a ser...

    Text Solution

    |

  5. Every atom makes one free electron in copper. If 1.1 A current is flow...

    Text Solution

    |

  6. A metal wire of resistance R is cut into three equal pieces that are t...

    Text Solution

    |

  7. Two cells X and Y are connected to a resistance of 10Omega shown in th...

    Text Solution

    |

  8. Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their l...

    Text Solution

    |

  9. As the temperature of a metallic resistor is increased,the product of ...

    Text Solution

    |

  10. What will b e the equivalent resistance b etween the A and D?

    Text Solution

    |

  11. In the arrangement of resistances shown in the circuit, the potential ...

    Text Solution

    |

  12. It is observed in a potentiometer experiment that no current passes th...

    Text Solution

    |

  13. The resistance across P and Q in the given figure is

    Text Solution

    |

  14. When no current is passed through a conductor,

    Text Solution

    |

  15. A Steady current flows in a metalic conductor of non uniform cross sec...

    Text Solution

    |

  16. Internal resistance of a cell depends on

    Text Solution

    |

  17. The resistance of the circuit between A and B is:-

    Text Solution

    |

  18. The number of free electrons per 100 mm of ordinary copper wire is 2xx...

    Text Solution

    |

  19. The poten tial difference between the terminals of a cells is found to...

    Text Solution

    |

  20. What is the reading of ammeter is adjoining circuit diagram.

    Text Solution

    |

  21. The following diagram shows the circuit for the comparision of e.m.f. ...

    Text Solution

    |