CBSE Class 12 > Class 12 Notes > 2. Electric Field - Theory Sheet, Class 12 Physics
2. Electric Field - Theory Sheet, Class 12 Physics
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FAQs on 2. Electric Field - Theory Sheet, Class 12 Physics
| 1. What is an electric field? |  |
Ans. An electric field is a region around a charged particle or object where an electric force is experienced by other charged particles. It is a vector quantity that describes the strength and direction of the force that would be exerted on a positive test charge placed in the field.
| 2. How is an electric field created? | |
Ans. An electric field is created by a charged object or particle. When a charged object is present, it exerts an electric force on other charged objects in its vicinity. This force creates an electric field that extends throughout the surrounding space.
| 3. What is the formula to calculate the electric field? | |
Ans. The formula to calculate the electric field at a point in space is given by E = kQ/r^2, where E is the electric field, k is the electrostatic constant (9 × 10^9 N m^2/C^2), Q is the charge creating the field, and r is the distance from the charge to the point where the field is being calculated.
| 4. How does the strength of an electric field vary with distance? | |
Ans. The strength of an electric field decreases with distance from the charged object creating the field. It follows an inverse square law, which means that the strength is inversely proportional to the square of the distance. As the distance increases, the electric field strength decreases.
| 5. How is the direction of an electric field determined? | |
Ans. The direction of an electric field is determined by the positive test charge placed in the field. A positive test charge placed in the field will experience a force in the direction of the electric field. Therefore, the direction of the electric field is the same as the direction in which a positive test charge would move if placed in the field.
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