A force F is needed to break a copperr wire having radius R. the force needed to break a copper wire of radius 2 R will be

A force F is needed to break a copper wire having radius R. The force needed to break a copper wire of same length and radius 2R will be

A force F is required to break a wire of length L and radius r. Find the force required to break a wire of the same material, length 2L and radius 4r.

The energy needed for breaking a drop of radius R into n drops each of radius r is

If T is the surface tension of a liquid, the energy needed to break a liquid drop of radius R into 64 drops is

One end of a horizontal thick copper wire of length 2L and radius 2R is welded to an end fo another horizontal thin copper wire of lenth L and radius R. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is

One end of a horizontal thick copper wire of length 2L and radius 2R is weded to an end of another horizontal thin copper wire of length L and radius R .When the arrangement is stretched by applying forces at two ends , the ratio of the elongation in the thin wire to that in the thick wire is

The breaking force for a wire is F N. What is the breaking force for two parallel wire of this size?

When a wire is stretched and its radius becomes r//2 then its resistance will be

What is the force experienced by a semicircular wire of radius R when it is carrying a current l and is placed in a uniform magnetic field of induction B as shown in figure. ?

In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5 Omega . The cable is replaced by 6 different insulated copper, wires the radius of each wire is 3 mm . Now the total resistance of the cable will be