The charges on two sphere are +7μC and – 5μC respectively. They experience a force F. If each of them is given and additional charge of – 2μC, the new force of attraction will be
A particle of mass 2kg is initially at rest. A force acts on it whose magnitude changes with time. The force-time graph is shown below. The velocity of the particle at t=10 sec is
A body of mass 5kg starts from the origin with an initial velocityu→=30i^+40j^ms−1 . If a constant forceF→=−(i^+5j^)N acts on the body, the time in which the y–component of the velocity becomes zero is :
In figure, two equal positive point charges q1 = q2 = 2.0 μC interact with a third point charge Q = 4.0 μC. The magnitude, as well as direction, of the net force on Q is
Two point charges 100 μC and 5 μC are placed at points A and B respectively with AB = 40 cm. The work done by external force in displacing the charge 5 μC from B to C, where BC = 30 cm, angle ABC =π2 and 14πε0=9×109Nm2/C2 ,is
The sum of the magnitudes of two forces acting at point is 18 and the magnitude of their resultant is 12. If the resultant is at 90o with the force of smaller magnitude, what are the magnitudes of forces?
Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge of an electron)
The resultant of two forces at right angle is 5 N. When the angle between them is 1200, the resultant is 13. Then, the forces are
Two equal point charges of 1 µC each are located at points (i^+j^+k^) m and (2i^+3j^-k^ ) m. What is the magnitude of electrostatic force between them?