Waves And Oscillations

Opposite charges attract each other. For SHM a restoring force acts on the bob this restoring force is accompanied by electrical force. Hence, restoring force changes from to

where . Also Since, acceleration increases time period decreases.

The acceleration due to gravity of earth is equal in magnitude to the force exerted by the earth on a body of unit mass. The motion of the bob is simple harmonic, hence its time period is given by Also if the periodic time of a pendulum is seconds, then it is called a second's pendulum. Also, where, is mass and is radius. ...(i) Second's pendulum on other planet is ...(ii) From Eqs. (i) and (ii), we have Hence, length of pendulum on planet is .

Under the influence of one force and under the action of another force, Under the action of both the forces

Since, one-fourth length is cut away so remaining length is hence k becomes