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For the circuit shown in the figure.

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Important Questions on Current Electricity

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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 21

Consider a thin square sheet of side L and thickness t, made of a material of resitivity ρ. The resistance between two opposite faces, shown by the shaded areas in the figure is: 

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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 22
Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with increase in temperature. If at room temperature, 100 W, 60 W and 40 W bulbs have filament resistances R100, R60 and R40, respectively, the relation between these resistances is
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 23
To verify Ohm's law, a student is provided with a test resistor RT, a high resistance R1, a small resistance R2, two identical galvanometers G1 and G2, and a variable voltage source V. The correct circuit to carry out the experiment is:
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 26

For the resistance network shown in the figure, choose the correct option(s).

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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 27
Heater of electric kettle is made of a wire of length L and diameter d. It takes 4 minutes to raise the temperature of 0.5 kg water by 40 K. This heater is replaced by a new heater having two wires of the same material, each of length L and diameter 2d. The way these wires are connected is given in the options. How much time in minutes will it take to raise the temperature of the same amount of water by 40 K?
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 31
An infinite line charge of uniform electric charge density λ lies along the axis of an electrically conducting infinite cylindrical shell of radius R. At time t = 0, the space inside the cylinder is filled with a material of permittivity ε and electrical conductivity σ. The electrical conduction in the material follows Ohm's law. Which one of the following graphs best describes the subsequent variation of the magnitude of current density j (t) at any point in the material?
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 32
Consider two identical galvanometers and two identical resistors with resistance R. If the internal resistance of the galvanometers RC< R2, which of the following statement(s) about any one of the
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Alpha Question Bank for Engineering: Physics>Chapter 24 - Current Electricity>Exercise - 3>Q 34

The current I drawn from the 5 volt source will be

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