If separation between screen and source is increased by 2% what would be the effect on the intensity

Answer the following questions : Observe the diagrams and answer the questions. If the distance between between the conductor and magnetic needle is increased, what will be the effect on the intensity of the magnetic field?

Increase : 90 by 2%

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

Light from a point source falls on a screen. If the separation between the source and the screen is increased by 1%, the illuminance will decrease (nearly) by

In a cinema hall the distance between the projector and the screen is increased by 2%. Now the intensity of illumination of the screen