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JEE Main Electric Charges and Fields — practice questions — page 2

Explore 141 free Electric Charges and Fields questions in JEE Main 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 31–60 of 141.

The work done in bringing a charge q from infinity to a point where the potential is V isRead 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 →When the separation between the plates of an air parallel-plate capacitor is doubled (keeping plate area constant), the capacitanceRead 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 →A 5 µF capacitor is charged to 200 V. The energy stored in it 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 →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 →Which property of charge is this?Read the answer and worked solution →Complete the quantisation ruleRead the answer and worked solution →True or false: charge and its propertiesRead the answer and worked solution →Conductor or insulator?Read the answer and worked solution →The sign convention from frictionRead the answer and worked solution →Complete Coulomb's lawRead the answer and worked solution →Constants and magnitudesRead the answer and worked solution →True or false: the superposition principleRead the answer and worked solution →Complete the definition of electric fieldRead the answer and worked solution →Which way does the field point?Read the answer and worked solution →True or false: electric field linesRead the answer and worked solution →Match each term to its definitionRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Tap every statement true of Coulomb's lawRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Order the steps: net force on one charge among manyRead the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Mobile chargesRead the answer and worked solution →True or false: fields and forcesRead the answer and worked solution →Assertion and reason: fieldsRead the answer and worked solution →Vector or scalar?Read the answer and worked solution →

Worked practice questions

The work done in bringing a charge q from infinity to a point where the potential is V is

  1. qV²
  2. q²V
  3. qV
  4. V/q
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Correct answer: C. qV

1. W = ∫ F·dl; equivalently W = q × (V_final − V_initial). 2. V at infinity = 0 by convention, so W = q × V. 3. Other options are dimensionally inconsistent with energy. _Source: syllabus Physics Part I, Ch 2 §2.7_

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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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When the separation between the plates of an air parallel-plate capacitor is doubled (keeping plate area constant), the capacitance

  1. remains unchanged
  2. becomes one-fourth
  3. doubles
  4. halves
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Correct answer: D. halves

1. C = ε₀ A / d. 2. Doubling d gives C' = ε₀ A / (2d) = C/2. 3. So capacitance halves; the field also halves at fixed Q. _Source: syllabus Physics Part I, Ch 2 §2.12_

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