Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET20228 Jul 2022Morning ShiftPhysicsElectromagnetic InductionActual

A circular coil of area 0.01 ~m ^2 and 40 turns is rotated about its vertical diameter with an angular speed of 50 rad s ⁻¹ in a uniform horizontal magnetic field 0.05 ~T . If the average power loss due to joule heating is 25 ~mW , then the closed loop resistance of the coil is

Options

  1. A50
  2. B12.5
  3. C75
  4. D20

Correct answer

D. 20

Step-by-step solution

We have aligned & e = d dt = NBA d dt ( t ) & = NBA t aligned aligned & e _ = NBA & e _ rms = NBA 2 aligned aligned & P_ avg = e _ rms ^2 R R = e _ rms ^2 P _ avg = N ^2 ~B ^2 ~A ^2 ^2 2 P _ avg & = 40^2 0.05^2 0.01^2 50^2 2 25 10⁻³ & =20 aligned

Practice Electromagnetic Induction on Quantrex Academy →

More from Electromagnetic Induction

A metallic circular loop is placed with its plane perpendicular to a uniform magnetic field of 0.3 T. If the radius of the loop decreases at a constant rate of 2 mm s⁻¹ , what will 2026A square loop of wire 2.2 cm on each side contains 2 turns and has a total resistance of 0.0002 . It is located 22 cm from a long straight current carrying wire. If the current in 2026A circular coil of radius 7 cm and 40 turns is rotated about its vertical diameter with an angular speed of 40 radians per second in a uniform horizontal magnetic field of 4 10⁻² T 2026An AC generator having 400 turns and an area of cross section of 2 10⁻³ m^2 rotates with an angular speed of 200 rad s⁻¹ in a uniform magnetic field of strength 0.4 T. The generato 2026A long solenoid of initial radius R₀ is put in a region of uniform magnetic field B with the axis of the solenoid aligned along the magnetic field. The solenoid is a part of a clos 2026In Faraday-Henry's experiment, a coil is connected to a galvanometer. For the deflection of pointer in the galvanometer, which of the following statement/s is/are WRONG? The pointe 2026In the figure shown, the conductor PQ of length l is moved from x = 0 to x = b and then up to x = 2b with a constant velocity v . A uniform magnetic field B is perpendicular to the 2026A coil having 100 square loops each of side 10 cm is placed such that its plane is normal to a magnetic field, which is changing at a rate of 0.7 ~T ~s ⁻¹ . The emf induced in the 2025 Full Electromagnetic Induction list All AP EAMCET PYQs