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Electrostatics question

2009 · Shift 0 · Q61
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Electrostatics question

2009 · Shift 0 · Q61

JEE MainPhysicsElectrostaticsMCQ+4 / −1
(This question contains Statement-1 and Statement-2. Of the four choices given after the statements, choose the one that best describes the two statements.) Statement-1 : For a charged particle moving from point PPP to point QQQ, the net work done by an electrostatic field on the particle is independent of the path connecting point PPP to point Q.Q.Q. Statement-2 : The net work done by a conservative force on an object moving along a closed loop is zero.
  1. A
    Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1.
  2. B
    Statement-1 is true, Statement-2 is true; Statement-2 is not the correct explanation of Statement-1.
  3. C
    Statement- 1 is false, Statement- 2 is true.
  4. D
    Statement- 1 true, Statement- 2 is false
View written solutionFree

Correct answer: A

  1. Analyze Statement-1

Electrostatic force is a conservative force. For any conservative force, the work done in moving a particle from point PPP to point QQQ depends only on the initial and final positions, not on the path.

Mathematically, WP→Q=−ΔU=U(P)−U(Q)W_{P\to Q} = -\Delta U = U(P)-U(Q)WP→Q​=−ΔU=U(P)−U(Q) so the work is determined only by the potential difference between PPP and QQQ.

Therefore, Statement-1 is true.

  1. Analyze Statement-2

A defining property of a conservative force is that the net work done over any closed path is zero: ∮F⃗⋅dr⃗=0\oint \vec{F}\cdot d\vec{r} = 0∮F⋅dr=0

Hence, Statement-2 is true.

  1. Check whether Statement-2 explains Statement-1

If the work done over every closed loop is zero, then consider two different paths from PPP to QQQ, say path 1 and path 2.

Let the work along path 1 be W1W_1W1​ and along path 2 be W2W_2W2​. Traverse from PPP to QQQ along path 1 and return from QQQ to PPP along path 2. This forms a closed loop.

So, W1+(−W2)=0W_1 + (-W_2) = 0W1​+(−W2​)=0 which gives W1=W2W_1 = W_2W1​=W2​

Thus, the work done from PPP to QQQ is independent of path. So Statement-2 is indeed the correct explanation of Statement-1.

  1. Evaluate options
  • A: Statement-1 is true, Statement-2 is true; Statement-2 is the correct explanation of Statement-1. ✅
  • B: Incorrect
  • C: Incorrect
  • D: Incorrect

Therefore, the correct answer is A.

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