A magnet kept at the centre of two coils A and B is moved to and fro as shown in the diagram. The two galvanometers show deflection.

State with a reason whether :

x > y

or

x < y [x and y are magnitudes of deflection]

(i) Why is a nuclear fusion reaction called a thermo nuclear reaction?

(ii) Complete the reaction:

³He₂ + ²H₁ ⟶ ⁴He₂ + ………. + Energy

A body of mass 10 kg is kept at a height of 5 m. It is allowed to fall and reach the ground.

(i) What is the total mechanical energy possessed by the body at the height of 2 m assuming it is a frictionless medium?

(ii) What is the kinetic energy possessed by the body just before hitting the ground? Take g = 10 m s^-2.

A uniform metre scale is in equilibrium as shown in the diagram :

(i) Calculate the weight of the metre scale.

(ii) Which of the following options is correct to keep the ruler in equilibrium when 40 gf wt is shifted to 0 cm mark?

F is shifted towards 0 cm

or

F is shifted towards 100 cm.