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Karnataka PUC II Electric Charges and Fields — practice questions — page 4

Explore 105 free Electric Charges and Fields questions in Karnataka PUC II Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electric Charges and Fields questions and exercises with answers

Showing questions 91–105 of 105.

Three capacitors of 2 µF each are connected in series. The equivalent capacitance isRead the answer and worked solution →An isolated conducting sphere of radius R carries a charge Q. The electric potential at its centre is (V(∞) = 0)Read the answer and worked solution →Two capacitors of 4 µF and 6 µF are connected in parallel and charged by a 10 V battery. The total charge stored isRead the answer and worked solution →NEET · Physics · Capacitors — Series or ParallelRead the answer and worked solution →Four equal point charges q sit at the corners of a square of side d. The work needed to assemble this configuration from infinity isRead the answer and worked solution →An electric dipole of moment p is placed in a uniform field E. The work done to rotate it from the orientation θ = 0 (aligned with the field) to θ = 180° isRead the answer and worked solution →Electric field at any point inside a hollow charged conductor isRead the answer and worked solution →On an equipotential surface, the work done in moving a test charge between any two points isRead the answer and worked solution →A parallel-plate capacitor in vacuum has plate area A and separation d. Its capacitance isRead the answer and worked solution →The work done in bringing a charge q from infinity to a point where the potential is V isRead the answer and worked solution →True or false: electrostaticsRead the answer and worked solution →A convex lens forms a real image at $60$ cm on one side of an object placed $20$ cm in front of it. Find the focal length of the lens.Read the answer and worked solution →Electric potential is a:Read the answer and worked solution →When light passes from one medium to another, which property remains **unchanged**?Read the answer and worked solution →NEET · Physics · Electric Charges & Fields · Force on Dipole in FieldRead the answer and worked solution →

Worked practice questions

Three capacitors of 2 µF each are connected in series. The equivalent capacitance is

  1. 2 µF
  2. 2/3 µF
  3. 6 µF
  4. 1/6 µF
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Correct answer: B. 2/3 µF

1. In series, 1/Cₑ = 1/C + 1/C + 1/C = 3/C. 2. Cₑ = C/3 = 2/3 µF. 3. Option (A) is the parallel result, so the trap is for students who mix the rules. _Source: syllabus Physics Part I, Ch 2 §2.14.1_

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An isolated conducting sphere of radius R carries a charge Q. The electric potential at its centre is (V(∞) = 0)

  1. kQ / (2R)
  2. kQ / R², directed outward
  3. kQ / R
  4. 0
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Correct answer: C. kQ / R

1. By your syllabus result 4 of §2.9, V is constant throughout a conductor in electrostatics. 2. The value at the centre equals the value at the surface = kQ / R. 3. (A) confuses E (=0 inside) with V; (C) is the field, not the potential. _Source: syllabus Physics Part I, Ch 2 §2.9 result 4_

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Two capacitors of 4 µF and 6 µF are connected in parallel and charged by a 10 V battery. The total charge stored is

  1. 24 µC
  2. 60 µC
  3. 40 µC
  4. 100 µC
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Correct answer: D. 100 µC

1. Parallel ⇒ Cₑ = 4 + 6 = 10 µF. 2. Q = Cₑ V = 10 × 10 = 100 µC. 3. Distractors come from using just one of the capacitors, or the series formula. _Source: syllabus Physics Part I, Ch 2 §2.14.2_

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