Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Concepts Of Physics MCQ Edition [Volume 2]PhysicsElectric Field and Potential

A ball having a mass of 100 g and a charge of 4.9 10⁻⁵ C is released from rest into an area containing a horizontal electric field of 2.0 10^4 N C ⁻¹ . Where will the ball be located after 2 s ?

Options

  1. A28 m from the starting point along its line of motion
  2. B14 m from the starting point along its line of motion
  3. C20 m from the starting point along its line of motion
  4. D56 m from the starting point along its line of motion

Correct answer

A. 28 m from the starting point along its line of motion

Step-by-step solution

Horizontal force acting on the ball: F_x = qE = (4.9 10⁻⁵) (2.0 10^4) = 0.98 N Vertical force acting on the ball (taking g = 10 m s ⁻² ): F_y = mg = 0.1 10 = 1 N Net force acting on the ball: F = F_x^2 + F_y^2 = (0.98)^2 + (1)^2 = 0.9604 + 1 = 1.9604 1.4 N Acceleration of the ball: a = F m = 1.4 0.1 = 14 m s ⁻² Distance traveled in t = 2 s : s = 1 2 at^2 = 1 2 14 (2)^2 = 28 m

Practice Electric Field and Potential on Quantrex Academy →

More from Electric Field and Potential

Determine the dimensional formula of ₀ .Two equal charges are situated at a separation of 1.0 m . What must be the magnitude of the charges so that the force between them is equivalent to the weight of a 50 kg person?Determine the electric force between two protons separated by a distance of 1 fermi ( 1 fermi = 10⁻¹⁵ m ). Protons within a nucleus remain at a separation of this order.Two charges of 2.0 10⁻⁶ C and 1.0 10⁻⁶ C are located at a separation of 10 cm . Determine where a third charge must be placed so that it experiences zero net force from these two cA 1.0 C charge is positioned at the top of a college building, while another equal charge is located at the top of a house. Assuming the separation between the two charges to be 2.Determine the separation at which two equal charges of 1.0 C each must be placed so that the force between them is equal to the weight of a 50 kg person.Two charges of 2.0 10⁻⁶ C and -1.0 10⁻⁶ C are placed at a separation of 10 cm . Determine the position where a third charge will experience zero net force.Two charged particles are separated by a distance of 1.0 cm . Determine the minimum possible magnitude of the electric force acting on each charge. Full Electric Field and Potential list All Concepts Of Physics MCQ Edition [Volume 2] PYQs