NEET Exam > NEET Notes > Physics Class 12 > Important Formulas: Electric Charges and Fields
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FAQs on Important Formulas: Electric Charges and Fields - Physics Class 12 - NEET
| 1. What is the formula for electric force between two point charges? |  |
Ans. The formula for electric force between two point charges is given by Coulomb's Law: \( F = \frac{k \cdot |q_1 \cdot q_2|}{r^2} \), where \( F \) is the electric force, \( k \) is Coulomb's constant, \( q_1 \) and \( q_2 \) are the magnitudes of the charges, and \( r \) is the distance between the charges.
| 2. How do you calculate the electric field created by a point charge? | |
Ans. The electric field created by a point charge can be calculated using the formula \( E = \frac{k \cdot |q|}{r^2} \), where \( E \) is the electric field, \( k \) is Coulomb's constant, \( q \) is the magnitude of the charge, and \( r \) is the distance from the charge.
| 3. What is the direction of the electric field around a positive point charge? | |
Ans. The electric field around a positive point charge points radially outward, away from the charge. This means that a positive test charge placed in the vicinity of the positive point charge would experience a repulsive force.
| 4. How does the magnitude of the electric field change with distance from a point charge? | |
Ans. The magnitude of the electric field created by a point charge decreases as the distance from the charge increases. This relationship is inversely proportional to the square of the distance from the charge, following the formula \( E = \frac{k \cdot |q|}{r^2} \).
| 5. Can two positive charges ever create an attractive electric field between them? | |
Ans. No, two positive charges will always create a repulsive electric field between them. The direction of the electric field lines produced by positive charges is always outward, indicating a repulsive force.
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