AB is a \(20\) \(\Omega\) resistor with a tapping point C that can be moved along AB. The resistances in AC, BC are proportional to the lengths AC, BC. Initially, C is at the mid-point of AB and the circuit is switched on.

If the tapping point C is moved so that the length BC is reduced to half its initial value, then the voltage across the \(15\) \(\Omega\) resistor,

If the tapping point C is moved so that the length BC is reduced to half its initial value, then the voltage across the \(15\) \(\Omega\) resistor,

1. | increases by \(1\) V |

2. | decreases by \(1\) V |

3. | increases by \(3\) V |

4. | decreases by \(3\) V |

Subtopic: Â Kirchoff's Voltage Law |

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The current flowing through the left \(20~\Omega\) resistor is:

1. | \(1\) A | 2. | \(0.5\) A |

3. | \(2.5\) A | 4. | \(3\) A |

Subtopic: Â Kirchoff's Voltage Law |

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All the cells, shown in the figure below, are of \(2\) V, and all the resistances are \(1\) \(\Omega\). When a potential difference \(V\) is applied between A and B, the current through the circuit doubles compared to the situation when the potential difference is made zero.

Then,

Then,

1. | \(V=2\) volt, positive at A. |

2. | \(V=2\) volt, negative at A. |

3. | \(V=6\) volt, positive at A. |

4. | \(V=6\) volt, negative at A. |

Subtopic: Â Kirchoff's Voltage Law |

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