The ratio of the cross-sectional areas of two wires of equal length made of the same metal is 1:2. From his...

The ratio of cross-sectional areas of two conducting wires made up of same material and having same length is 1: 2. What will be the ratio of heat produced per second in the wires, when same current is flowing in them?

Two wires A and B are of equal lengths, different cross-sectional areas and made of the same metal. (a) (i) Name the property which is same for both the wires. (ii) Name the property which is the different for both the wires (b) I fthe resistance of wire A is four times the resistance of wire B , calculate (i) the ratio of the cross-sectional area of the wires. (ii) the ratio of the radii of the wires.

The area of cross-section of a metal wire is doubled, keeping its length same, then its resistance is:

The Young's modulus of steel is twice that of brass. Two wires of the same length and of the same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weight added to the steel and brass wires must be in the ratio of

Four wires of equal length 2 m are arranged as shown in the figure. Wires , 2, 3 and 4 are of equal cross-sectional area and wire 1 is of half the cross section of these wires. By how much distance pointer at point 5 must be moved to get null point ?

A wire of cross-sectional area A breaks due to its own weight when length of the wire is l. If area of cross-section of the wire is made 3A then maximum length of the wire can be hung without breaking is

A light rod of length 2 m is suspended from the ceiling horizontally by means of two vertical wires of equal length tied to its ends. One of the wires is made of steel and is of cross section 0.1 cm^(2) . The other wire is a brass of cross section 0.2 cm^(2) . A weight is suspended from a certain point of the rod such that equal stress are produced in both the wires. Which of the following are correct?

Two wires X,Y have the same resistivity, but their cross-sectional areas are in the ratio 2 : 3 and lengths in the ratio 1 : 2 . They are first connected in series and then in parallel to a.d.c. source. Find out the ratio of drift speeds of the electrons in the two wires for the two cases.

Two metalic wires A and B are of same material and have equal length. If the cross-sectional area of B is double that of A, then which one among the following is the electrical resistance of B?