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question_answer1) When the switch S, in the circuit shown, is closed then the value of current i (in ampere) will be:
question_answer2) A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is:
question_answer3) In the given circuit the internal resistance of the 18V cell is negligible. \[{{R}_{1}}=400\Omega ,\,\,{{R}_{3}}=100\Omega \] and \[{{R}_{4}}=\text{ }500\Omega \] the reading of an ideal voltmeter across \[{{R}_{4}}\] is 5V, then the value of \[{{R}_{2}}(in\,\,\Omega )\] will be:
question_answer4) A uniform metallic wire has a resistance of \[18\Omega \] and is bent into an equilateral triangle. Then, the resistance \[\left( in\text{ }\Omega \right)\] between any two vertices of the triangle is:
question_answer5) A 2 W carbon resistor is color coded with green, black, red and brown respectively. The maximum current (in mA) which can be passed through this resistor is:
question_answer6) The actual value of resistance R, shown in the figure is \[30\Omega \]. This is measured in an experiment as shown using the standard formula\[R=\frac{V}{1}\], where V and I are the reading of the voltmeter and ammeter, respectively. If the measured value of R is 5% less, then the internal resistance \[\left( in \text{ }\Omega \right)\] of the voltmeter is:
question_answer7) A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power (in watt) when an ideal power supply of 11 V is connected across it is:
question_answer8) The amount of charge Q passed in time t through a cross- section of a wire is \[Q=\left( 5{{t}^{2}}+3t+1 \right)\]coulomb. The value of current (in ampere) at time \[t=5\text{ }s\]is
question_answer9) A current of 1 mA flows through a copper wire. How many electrons will pass through a given point in each second?
question_answer10) At what temperature \[(in\text{ }{}^\circ C)\] will the resistance of a copper wire becomes three times its value at\[0{}^\circ C\]? (Temperature coefficient of resistance of copper is \[4\times {{10}^{-3}}/{}^\circ C)\]
question_answer11) In the circuit shown in Fig, the current in \[4\Omega \] resistance is 1.2 A. What is the potential difference (in volt) between B and C?
question_answer12) A current of 30A is registered when the terminals of a dry cell of emf 1.5V are connected through an ammeter. (Neglect the ammeter resistance). The amount of heat produced (in joule) in the battery in 20s is
question_answer13) A 100 watt bulb working on 200 volt has resistance R and a 200 watt bulb working on 100 volt has resistance S. If the R/S is \[\frac{8}{x}\]. Find the value of x.
question_answer14) The total power dissipated in watts in the circuit shown here is
question_answer15) In an ideal metre-bridge, the balancing length from the left end when standard resistance of \[1\Omega \] is in right gap is found to be 20 cm. The value of unknown resistance \[\left( in\text{ }\Omega \right)\] is
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