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The current in a wire varies with time according to the equation \(I=(4+2t),\) where \(I\) is in ampere and \(t\) is in seconds. The quantity of charge which has passed through a cross-section of the wire during the time \(t=2\) s to \(t=6\) s will be:

1. | \(60\) C | 2. | \(24\) C |

3. | \(48\) C | 4. | \(30\) C |

Subtopic: Current & Current Density |

83%

From NCERT

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The Wheatstone bridge shown in the figure below is balanced when the uniform slide wire \(AB\) is divided as shown. Value of the resistance \(X\) is:

1. \(3~\Omega\)

2. \(4~\Omega\)

3. \(2~\Omega\)

4. \(7~\Omega\)

Subtopic: Meter Bridge & Potentiometer |

89%

From NCERT

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What is total resistance across terminals \(A\) and \(B\) in the following network?

1. | \(R\) | 2. | \(2R\) |

3. | \(\dfrac{3R}{5}\) | 4. | \(\dfrac{2R}{3}\) |

Subtopic: Combination of Resistors |

71%

From NCERT

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When two resistances \(X\) and \(Y\) are put in the left hand and right hand gaps in a Wheatstone meter bridge, the null point is at \(60\) cm. If \(X\) is shunted by a resistance equal to half of itself, then the shift in the null point will be:

1. | \(26.7\) cm | 2. | \(33.4\) cm |

3. | \(46.7\) cm | 4. | \(96.7\) cm |

Subtopic: Meter Bridge & Potentiometer |

From NCERT

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A voltmeter of resistance \(660~\Omega\)$\mathrm{}$ reads the voltage of a very old cell to be \(1.32\) V while a potentiometer reads its voltage to be \(1.44\) V. The internal resistance of the cell is:

1. \(30~\Omega\)$\mathrm{}$

2. \(60~\Omega\)

3. \(6~\Omega\)

4. \(0.6~\Omega\)$\mathrm{}$

Subtopic: EMF & Terminal Voltage |

77%

From NCERT

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Six similar bulbs are connected as shown in the figure with a DC source of emf \(E\) and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section \(\mathrm{A}\) and one from section \(\mathrm{B}\) are glowing, will be:

1. | \(2:1\) | 2. | \(4:9\) |

3. | \(9:4\) | 4. | \(1:2\) |

Subtopic: Heating Effects of Current |

64%

From NCERT

NEET - 2019

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The power dissipated across the \(8~\Omega\) resistor in the circuit shown here is \(2~\text{W}\). The power dissipated in watts across the \(3~\Omega\) resistor is:

1. | \(2.0\) | 2. | \(1.0\) |

3. | \(0.5\) | 4. | \(3.0\) |

Subtopic: Heating Effects of Current |

69%

From NCERT

AIPMT - 2006

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In the circuit shown below, if a conducting wire is connected between points \(A\) and \(B\), the current in this wire will: (All resistances are given in ohms)

1. | flow from \(A\) to \(B\) |

2. | flow in the direction which will be decided by the value of \(V\) |

3. | be zero |

4. | flow from \(B\) to \(A\) |

Subtopic: Kirchoff's Voltage Law |

53%

From NCERT

AIPMT - 2006

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Three resistances \(\mathrm P\), \(\mathrm Q\), and \(\mathrm R\), each of \(2~\Omega\) and an unknown resistance \(\mathrm{S}\) form the four arms of a Wheatstone bridge circuit. When the resistance of \(6~\Omega\) is connected in parallel to \(\mathrm{S}\), the bridge gets balanced. What is the value of \(\mathrm{S}\)?

1. | \(2~\Omega\) | 2. | \(3~\Omega\) |

3. | \(6~\Omega\) | 4. | \(1~\Omega\) |

Subtopic: Wheatstone Bridge |

81%

From NCERT

AIPMT - 2007

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The total power dissipated in watts in the circuit shown below is:

1. | \(16\) W | 2. | \(40\) W |

3. | \(54\) W | 4. | \(4\) W |

Subtopic: Heating Effects of Current |

87%

From NCERT

AIPMT - 2007

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