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

A storage battery of emf 10 V and internal resistance 2 is being charged by a 30 V DC supply using a series resistor of 3 as shown in the given figure. The terminal voltage of the battery during the charging process is:

Options

  1. A12 V
  2. B2 V
  3. C22 V
  4. D18 V

Correct answer

D. 18 V

Step-by-step solution

The net electromotive force (EMF) in the circuit is the difference between the two opposing voltage sources: E_ net = 30 V - 10 V = 20 V The total resistance in the series circuit is: R_ total = 3 + 2 = 5 The current I flowing through the circuit is: I = E_ net R_ total = 20 5 = 4 A During the charging process, the current flows into the positive terminal of the 10 V battery. The terminal voltage V across the battery is given by: V = E + Ir Substituting the given values: V = 10 + (4 2) V = 10 + 8 = 18 V Answer: 18

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