Question

Digester
Q5: What happens to the image distance in the
eye when we increase the distance of an object
from the eye?
(3)
Q6: What do you mean by Electric power? Derive
its expression also. (3)
તો મા રોકાયા
07. State and explain Coulombs Law in​

Answer 1

Answer:

Q5 The image is formed on the retina even on increasing the distance of an object from the eye. For this eye lens becomes thinner and its focal length increases as the object is moved away from the eye.

Q6The rate at which electric energy is dissipated or consumed in an electric circuit is called electric power. It's SI unit is Watt (W). power = work done / time taken. we know that work done by current I when it flows for time T under potential difference V is given by : W = V*I*T joul

Q7 According to Coulomb's law, the force of attraction or repulsion between two charged bodies is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

Answer 2

Answer:

Explanation:

• There is no change to the image distance in the eye when we increase the distance of an object from the eye. To see closer or distant object clearly, the eyes, due to its ability of accommodation, can increase or decrease focal length of its lens, so that the image is always formed at retina.
• Electrical energy is the energy derived from electric potential energy or kinetic energy of the charged particles. In general, it is referred to as the energy that has been converted from electric potential energy. We can define electrical energy as the energy generated by the movement of electrons from one point to another. The movement of charged particles along/through a medium (say wire) constitute current or electricity.
• E = QV
• Where,
• Q is charge
• V is the potential difference
• Joule (J)
• Kilowatt-hour(kWh)
• Electron-Volt(eV)
• Coulomb's law in electrostatic states that a charge at rest q1 applies a force F on the other charge q2, also at rest, which are separated by a distance r such that the force is directly proportional to the product of both charges and inversely proportional to the square of the distance between them. ∴ F ∝ q1