Current Electri...

Two conductors are made of the same material and have the same length. Conductor A is a solid wire of diameter 1.0 mm. Conductor B is a hollow tube of outside diameter 2.0 mm and inside diameter 1.0 mm.The resistance ratio R_A/R_B will be

A wire has resistance of 24 Ω is bent in the following shape. The effective resistance between A and B is

In the circuit shown in figure, find the current through the branch BD

Electric field (E) and current density (./) have relation

When current flows through a conductor, then the order of drift velocity of electrons will be

Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper = 9 × 10³ kg m^–3 and atomic weight = 63)

The current flowing through a wire depends on time as I = 3t² + 2t + 5. The charge flowing through the cross-section of the wire in time from t = 0 to t = 2 sec. is

The specific resistance of manganin is 50 × 10^–8 ohm × m. The resistance of a cube of length 50 cm will be

The resistivity of iron is 1 × 10^–7 ohm–m. The resistanceof a iron wire of particular length and thickness is 1 ohm. If the length and the diameter of wire both are doubled, then the resistivity in ohm–m will be

The temperature coefficient of resistance for a wire is 0.00125/°C. At 300 K its resistance is 1 ohm. The temperature at which the resistance becomes 2 ohm is