Current Electricity questions
395 published questions with worked solutions.
- A wire of length 'l' and resistance 100 , is divided into 10 equal parts. The first 5 parts are connected in series while the...
- A charged particle having drift velocity of 7.5 10^ -4 m s^ -1 in an electric field of 3 10^ -10 V m^ -1 , has a mobility in m^2...
- Two resistors of 200 Ω and 400 Ω are connected in series with a battery of 100 V. A bulb rated at 200 V, 100 W is connected...
- When an external resistance of 5Ω is connected across terminals of a cell, a current of 0.25 A flows through it. When the 5Ω...
- Two cells of emfs 1 V and 2 V and internal resistance 2 Ω and 1 Ω, respectively connected in parallel, gave a current of 1 A...
- 10 resistors, each of resistance R are connected in series to a battery of emf E and negligible internal resistance. Then those...
- Column-I gives certain physical terms associated with flow of current through a metallic conductor. Column-II gives some...
- The effective resistance of a parallel connection that consists of four wires of equal length, equal area of cross-section and...
- At room temperature (27°C), the resistance of a heating element is 50Ω. The temperature coefficient of the material is 2.4 × 10⁻⁴...
- The electric current through a wire varies with time as I = I₀ + βt, where I₀ = 20 A and β = 3 A/s. The amount of electric charge...
- When a potential difference V is applied across a wire of resistance R, it dissipates energy at a rate W. If the wire is cut into...
- By what percentage will the illumination of the lamp decrease if the current drops by 20%?
- Two conductors have the same resistances at 0°C but their temperature coefficients of resistance are α₁ and α₂. The respective...
- Due to cold weather a 1 m water pipe of cross–sectional area 1 cm^2 is filled with ice at –10°C. Resistive heating is used to...
- Two resistors R_1=(4 0.8) and R_2=(4 0.4) are connected in parallel. The equivalent resistance of their parallel combination will...
- A uniform heating wire of resistance 36 is connected across a potential difference of 240 V. The wire is then cut into half and...
- A resistor develops 500 J of thermal energy in 20s when a current of 1.5 A is passed through it. If the current is increased from...
- The energy dissipated by a resistor is 10 mJ when an electric current of 2 mA flows through it in 1s. The resistance is _______ ....
- A conducting wire of length 'l', area of cross-section A and electric resistivity is connected between the terminals of a...
- A current of 10A exists in a wire of crosssectional area of 5 mm ^2 with a drift velocity of 2 10^ -3 ms ^ -1 . The number of...
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