Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET2026PhysicsChapterActual

The figure shows a branch of an electrical circuit. At a given instant, the current I flowing from Q to P is 3 A and it is decreasing at a rate of 4 A/s . If point Q is connected to the ground, what is the electric potential at point P?

Options

  1. A-8 V
  2. B+4 V
  3. C-4 V
  4. D-16 V

Correct answer

C. -4 V

Step-by-step solution

Applying Kirchhoff's Voltage Law (KVL) from point Q to point P, we can write the equation for the potential difference: V_Q - I R - L dI dt + E = V_P Given the parameters in the problem: Point Q is grounded, so V_Q = 0 V . The current I flowing from Q to P is 3 A . The current is decreasing at a rate of 4 A/s , so the rate of change of current is dI dt = -4 A/s . The resistance R = 4 . The inductance L = 0.5 H . The battery has an EMF E = 6 V . Traversing from Q to P, we move from the negative (shorter, thicker lin

Practice Chapter on Quantrex Academy →

More from Chapter

A solid spherical body of radius R , density , and specific heat capacity s is initially at temperature T₀ . It is placed in a vacuum chamber at absolute zero and cools by emitting 2026A straight canal has motorboats departing from two terminals at opposite ends. The motorboats depart at regular intervals of T minutes in both directions and travel at a constant s 2026A wooden crate is released from rest at the top of a ramp inclined at 37^ to the horizontal. When the ramp is perfectly smooth, the crate reaches the bottom with a speed v . When t 2026A uniform horizontal beam of mass 6 kg and length L is hinged to a vertical wall at one end. The other end is supported by a light inextensible wire attached to the same wall, maki 2026A bullet P of mass 30 g moving with a speed of 200 m/s penetrates a target and comes to rest after travelling a distance of 10 cm inside it. Another bullet Q of mass 20 g moving wi 2026A small block of mass m is placed at the highest point of a smooth fixed sphere of radius R . It is given a horizontal initial speed v₁ such that it slides down the surface. The bl 2026A block of mass 2 kg is projected with an initial speed of 14 m/s on a rough horizontal surface. The coefficient of kinetic friction between the block and the surface is 0.2 . Afte 2026A uniform horizontal circular disc of mass M and radius R is rotating freely about a vertical axis passing through its center at an angular speed of 40 rpm . Two small blocks, each 2026 Full Chapter list All NEET PYQs