When load is applied to a wire, the extension is 3 mm, the extension in the wire of same length but half the radius by the same load is
(A) 0.75 mm
(B) 6 mm
(C) 1.5 mm
(D) 12.0 mm
1 Answers
Talk Doctor Online in Bissoy App
A copper wire has a resistance of \( 0.60 hm \). Anozner copper wire of the samemass as the first one is dou ble in length of the first. Find the resistance of the second wire.
We know that R = ρl/A R ∝ l R1/R2 = l1/l2 Given ∵ l2 = 2l1 R1 = 0.60 hm R2/R1 = l2/l1 R2/R1 = 2l1/l1 R2 = 2 R1 R2 = 2 x 0.60 R2 = 1.2 hm
2 Answers 3 views
A man travels half time of its journey with speed of 5m/s and for remaining half time he moves half of its total distance travelled, with speed of 3 m
Correct Answer - 4.5 m/s
2 Answers 1 views
A steel wire is acted upon by a load of 10 N. Calculate the extension produced in the wire, if the strain energy stored in the wire is 1.1 × 10^-3 J.
Given: F = 10 N, Strain energy = 1.1 × 10-3 J, To find: Extension (l) Formula: W = \(\frac{1}{2}\) × F × l Calculation: From formula, l = \(\frac{2\,W}{F}=\frac{2\times1.1\times10^{-3}}{10}\) = 2.2 × 10-4 m. The extension produced in the wire is...
2 Answers 4 views
Two wires of the same material have radii rA and rB respectively. The radius of wire A is twice the radius of wire B.
Correct option is: (D) four times that of A.
2 Answers 1 views
The length of a wire increases by 1% by a load of 2 kg wt. The linear strain produced in the wire will be
Correct option is: (C) 0.01
2 Answers 1 views
A wire of length ‘L’, radius ‘r’ when stretched with a force ‘F’ changes in length by l’. What will be the change in length of a wire
Correct option is: (B) l
2 Answers 1 views
A copper wire (Y = 1 × 10^11 N/m^2) of length 6 m and a steel wire (Y = 2 × 10^11 N/m^2) of length 4 m each of cross-section 10^-5 m^2 are fastened
Correct option is: (C) 0.6 mm
2 Answers 1 views
When a force is applied to the free end of a metal wire, metal wire undergoes (A) longitudinal and lateral extension.
(B) longitudinal extension and lateral contraction.
2 Answers 1 views
If work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of same material, but with double the radius and half
Correct option is: (D) 16
2 Answers 1 views
When a current I is set up in a wire of radius r, the drift speed is vd. If the same current is set up through a wire of radius 2r
Correct option is: (A) vd/4
2 Answers 1 views