Three point charges of magnitude \(5\) \(μC\), \(0.16μC\) and \(0.3μC\) are located at the vertices, \(B, C\) of a right angled triangle whose sides are \(AB = 3\) cm, \(BC = 3\sqrt2\) cm and \(CA = 3\) cm and point A is the right angle corner. Charge at point A, experiences ______N of electrostatic force due to the other two charges.
Correct Answer: 17
Solution and Explanation
\(F_{AC} = \frac{k(5 \times 0.3) \times 10^{-12}}{9 \times 10^{-4}}\)
\(F_{AB} = \frac{k(5 \times 0.16)\times 10^{-12}}{9\times 10^{-4}}\)
\(F_{net} = \frac{k \times 10^{-12}}{9\times 10^{-4}} \sqrt{1.5^2+(0.8)^2}\)
= \(\frac{10^9 \times 10^{-12}}{10^{-4} \times 1.7}\)
= \(17\)
Top Questions on Electric Charge
- An electric dipole consists of charges \(\pm 4 \mu C\) separated by a distance of \(6\,cm\). Calculate the electric field at a point on the axial line at a distance \(20\,cm\) from its center.
- The force between two point charges separated by a distance \(d\) is \(F\). If one charge is moved away by a distance \(d\), then the new force is:
- KEAM - 2025
- Physics
- Electric Charge
Two point charges M and N having charges +q and -q respectively are placed at a distance apart. Force acting between them is F. If 30% of charge of N is transferred to M, then the force between the charges becomes:
- COMEDK UGET - 2024
- Physics
- Electric Charge
- Force between two point charges \( q_1 \) and \( q_2 \) placed in vacuum at a distance \( r \, \text{cm} \) apart is \( F \). Force between them when placed in a medium having dielectric \( K = 5 \) at \( r/5 \, \text{cm} \) apart will be:
- MHT CET - 2024
- VITEEE - 2024
- Physics
- Electric Charge
- A proton, an electron, and an alpha particle have the same energies. Their de-Broglie wavelengths will be compared as:
- MHT CET - 2024
- Physics
- Electric Charge
Questions Asked in JEE Main exam
A bob of mass \(m\) is suspended at a point \(O\) by a light string of length \(l\) and left to perform vertical motion (circular) as shown in the figure. Initially, by applying horizontal velocity \(v_0\) at the point ‘A’, the string becomes slack when the bob reaches at the point ‘D’. The ratio of the kinetic energy of the bob at the points B and C is:
- JEE Main - 2025
- Kinetic Energy
- The number of different 5 digit numbers greater than 50000 that can be formed using the digits 0, 1, 2, 3, 4, 5, 6, 7, such that the sum of their first and last digits should not be more than 8, is:
- JEE Main - 2025
- permutations and combinations
- A bar magnet has total length \( 2l = 20 \) units and the field point \( P \) is at a distance \( d = 10 \) units from the centre of the magnet. If the relative uncertainty of length measurement is 1%, then the uncertainty of the magnetic field at point P is:
- JEE Main - 2025
- Magnetic Field
- A force of 49 N acts tangentially at the highest point of a sphere (solid of mass 20 kg) kept on a rough horizontal plane. If the sphere rolls without slipping, then the acceleration of the center of the sphere is:
- JEE Main - 2025
- Quantum Mechanics
Let $ P_n = \alpha^n + \beta^n $, $ n \in \mathbb{N} $. If $ P_{10} = 123,\ P_9 = 76,\ P_8 = 47 $ and $ P_1 = 1 $, then the quadratic equation having roots $ \alpha $ and $ \frac{1}{\beta} $ is:
- JEE Main - 2025
- Relations and functions
Concepts Used:
Electric Charge
What is Electric Charge
It is the property of subatomic particles that experiences a force when put in an electric and magnetic field. It is are of two types: Positive and Negative. It commonly carried by charge carriers protons and electrons.
Properties of Electric Charge
Various properties of charge include the following :-
- Additivity of Electric Charge
- Conservation of Electric Charge
- Quantization of Electric Charge
Types of electric charge
Two kinds of electric charges are there :-
Negative Charge - When an object has a negative charge it means that it has more electrons than protons.
Positive Charge - When an object has a positive charge it means that it has more protons than electrons.
When there is an identical number of positive and negative charges, the negative and positive charges would cancel out each other and the object would become neutral.