A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?

Related Mcqs:

1. When a force is applied at one end of an elastic wire it produces at strain ∝ in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?

   A. Y∝
   B. 2Y∝
   C. Y∝/2
   D. Y∝2

2. A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?

   A. FE
   B. (FE)
   C. FE2/L
   D. FE2

3. A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire ?

   A. 0.01J
   B. 0.02J
   C. 0.04J
   D. 1.0J

4. A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?

   A. (F1+F2) (121+122)
   B. (F1+F2) (122-112)
   C. (F1+F2) (12-11)
   D. (F1+F2) (12-11)

5. Force 100N is applied on a wire produces extension 5mm in it. Energy stored in it is

   A. 0.125 J
   B. 0.250 J
   C. 0.50 J
   D. 1 J

   Submitted by: Huzaifa Naseer

6. A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?

   A. 0.025J
   B. 0.50J
   C. 0.75J
   D. 0.100J

7. What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?

   A. 1A
   B. 10A
   C. 100A
   D. 1000A

8. Two identical metal balls with charges + 2Q and – Q are separated by some distance, and exert a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now be_________?

   A. F
   B. F/2
   C. F/4
   D. F/8

   Submitted by: Tauseef Ali

9. A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes up to 2 in height further, find the magnitude of the force. Consider g = 10m/s 2

   A. 22N
   B. 16N
   C. 20N
   D. 4N

   Submitted by: Huzaifa Naseer

10. The speed of stationary waves in a stretched string are independent of___________________?

    A. Number of loops
    B. Tension in the string
    C. Point where string is plucked
    D. both A and C