Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio (rironrcopper) of their radii must be [ Given that specific resistance of iron =1.0×10−7 Ωm and that of copper =1.7×10−8 Ωm ]

Equal potentials are applied on an iron and copper wire of same length

1.	Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio (rironrcopper) of their radii must be [ Given that specific resistance of iron =1.0×10−7 Ωm and that of copper =1.7×10−8 Ωm ]
Answer» Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio $(\frac{r_{i r o n}}{r_{c o p p e r}})$ of their radii must be [ Given that specific resistance of iron $= 1.0 \times 10^{- 7} Ω m$ and that of copper $= 1.7 \times 10^{- 8} Ω m$ ]

Discussion

No Comment Found

Related InterviewSolutions

The same retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the distance will be
A block of wood floats in water with 45th of its volume submerged but in another liquid, it floats fully submerged. The density of the unknown liquid is (in kg/m3)
A machine which is 75 percent efficient, uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is (in m/s)
A stone is allowed to fall from the top of a tower 80 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 20 m/s along the same line of motion. The two stones will meet after -
A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept along the same axis with a distace d between them. If a parallel beam of light falling on A leaves B as a parallel beam, then d is equal to (IIT-JEE 1985)
A kid of mass 50 kg stands at the edge of a platform of radius 1 m which can be freely rotated about its axis. The moment of inertia of the platform is 0.02 kg-m2. The system is at rest. The kid throws a ball of mass 2 kg horizontally to his friend (friend standing on the ground) in a direction tangential to the rim with a speed 10 m/s as seen by his friend. The angular velocity with which the platform will start rotating in rad/s is
Two cars of unequal masses use similar tyres. If they are moving at the same initial speed, the minimum stopping distance
The maximum range of a gun on horizontal terrain is 16 km. If g=10 m/s2. What must be the muzzle velocity of the shell
The temperature inside and outside of the refrigerator is 260 K and 315 K respectively. Assuming that the refrigerator cycle is reversible, calculate the heat delivered to the surroundings for every joule of work done.
The electric potential at a point (x, y) in the x - y plane is given by V = - kxy. The field intensity at a distance r from the origin varies as

Equal potentials are applied on an iron and copper wire of same length. In order to have same current flow in the wire, the ratio (rironrcopper) of their radii must be [ Given that specific resistance of iron =1.0×10−7 Ωm and that of copper =1.7×10−8 Ωm ]

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment