The potential difference across a straight wire of `10^(-3) cm^(2)` cross sectional area and 50cm length is 2V, when a current of 0.25A flows in the wire. Calculate.
(a) The field strength is the wire
(b) The current density and
(c) The conductivity of the metal

The specific resistance of a potentiometer wire is 10^(-7) Omega m and the cross sectional area of the wire is 10^(-6)m^(2) . If a current of 0.1 A flows through the wire, then the potential gradient will be

When a potential difference of 2 V is applied across the ends of a wire of 5 m length, a current of 1 A is found to flow through it. Calculate (i) the resistance per unit length of the wire, (ii) the resistance of 2 m length of the wire. (iii) the resistance across the ends of the wire if it doubled on itself.

A long straight wire of circular cross- section carries a current along its length. On the axis inside the wire, it follows that

Write Ampere's circuital law.A long straight wire of a circular cross section (radius a ) carrying steady current.Current is uniformly distributed in the wire.Calculate magnetic field inside the region (r lt a) in the wire.

A straight thick long wire of uniform cross-section of radius 5cm is carrying a steady current 5A . Calculate the magnetic field at a point 2cm from the axis of wire, well inside the wire.

A cross–sectional area of a copper wire is 3xx10^(–6) m^2 . The current of 4.2 amp. is flowing through it. The current density in "amp"//m^2 through the wire is –

A current of 4.8 A is flowing in a copper wire of cross-sectional area 3xx10^(-4) m^(2) . Find the current density in the wire.

A wire of 50 cm long, 1mm^(2) in cross-section carries a current of 4 A, when connected to a 2 V battery, the resistivity of wire is

Figure shows a long straight wire of a circular cross-section (radius a) carrying steady current l. The current l is uniformly distributed across this cross-section. Calculate the magnetic field in the region r lt a and r gt a