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Class 12 · Physics · Hard
→Three equal positive charges are placed at the corners of an equilateral triangle. On one charge, each of the other two charges exerts a force of 40 N. What is the net force?
Class 12 · Physics · Hard
→Two equal forces act on a charge at an angle of 120°. If their resultant is 24 N, what is the magnitude of each force?
Class 12 · Physics · Hard
→Two equal forces act on a charge at an angle of 30°. If each force is 20 N, in which direction will the resultant act?
Class 12 · Physics · Hard
→If the electrostatic force must become four times as large while the product of the charges becomes sixteen times as large, how should the distance change?
Class 12 · Physics · Hard
→If the product of the charges becomes 25 times larger and the force must remain unchanged, what change in distance is required?
Class 12 · Physics · Hard
→The force between two charges is 145.8 N. If both charges become five times as large and the distance becomes three times as large, what is the new force?
Class 12 · Physics · Hard
→The force between two charges is 108 N. If one charge is tripled and the distance is made six times, what is the new force?
Class 12 · Physics · Medium
→What is the best way to avoid mistakes in a difficult multiple-charge Coulomb-law problem?
Class 12 · Physics · Hard
→A target charge is at the centre of a square. Equal positive charges occupy one pair of opposite corners and equal negative charges occupy the other pair of opposite corners. If all charge magnitudes are equal, what is the net force on the target?
Class 12 · Physics · Hard
→Equal positive charges are placed at all four corners of a square. For a charge at one corner, how does the force due to the opposite corner compare with the force due to an adjacent corner?
Class 12 · Physics · Hard
→A negative target charge has an equal positive charge above it and an equal negative charge below it, both at equal distances. What is the direction of the net electric force on the target?
Class 12 · Physics · Hard
→A positive target charge has an equal positive charge above it and an equal negative charge below it, both at equal distances. What is the direction of the net electric force on the target?
Class 12 · Physics · Medium
→A target is acted upon by forces of 7 N eastward and 24 N northward. In which direction does the resultant force point?
Class 12 · Physics · Hard
→Two charges initially repel each other. If one charge is made four times larger and the sign of the other charge is reversed, what will be the nature and magnitude of the new force relative to the original?
Class 12 · Physics · Hard
→Two charges initially attract each other. If the magnitudes of both charges are tripled and the sign of only one charge is reversed, what will be the nature and magnitude of the new force relative to the original?
Class 12 · Physics · Medium
→The distance between two equal charges is halved. To keep the electrostatic force unchanged, what should happen to each charge?
Class 12 · Physics · Medium
→Two equal charges separated by a distance of 2 units exert a certain force. If the distance is increased to 4 units, by what factor should each charge be changed to produce the same force?
Class 12 · Physics · Medium
→If the vector sum of three forces is zero, and the first two perpendicular forces are 6 N and 8 N, what is the magnitude of the third force?
Class 12 · Physics · Medium
→Two external charges exert perpendicular forces of 21 N and 28 N on a target charge. What is the magnitude of the resultant force?
Class 12 · Physics · Medium
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