Apolarized light beam, with a 7.55 mm diameter circular cross section, is perpendicularly incident on an ideal polarizer, serving as an analyzer. the intensity of the light is 3.87 kw/m2 and the angle between the beam's polarization direction and the polarization axis of the polarizer is 19.9∘. what force in piconewtons does the light exert on the polarizer?

The force is

Explanation:

Given that,

Diameter = 7.55 mm

Intensity of light = 3.87 kW/m²

Angle = 19.9°

Intensity of absorbed light

Intensity of incoming light

Ratio of intensities

Relation between intensity and power

...(I)

The power is

....(II)

From equation (I) and (II)

Put the value into the formula

Hence, The force is

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it