Day 391: JEE Mains Physics

1. A.
   At $5\text{ }cm$ from $20\mu C$ on the left side of system
2. B.
   At $5\text{ }cm$ from $- 5\mu C$ on the right side
3. C.
   At $1.25\text{ }cm$ from $- 5\mu C$ between two charges
4. D.
   At midpoint between two charges

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1. A.
   $15\pi$
2. B.
   $10\sqrt{2}$
3. C.
   30
4. D.
   $5\pi$

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1. A.
   $\sqrt{A^{2} + B^{2}},\tan^{- 1}\left\lbrack \frac{B}{A} \right\rbrack$
2. B.
   $\sqrt{A^{2} + B^{2}},\tan^{- 1}\left\lbrack \frac{A}{B} \right\rbrack$
3. C.
   $A + B,\tan^{- 1}\left\lbrack \frac{B}{A} \right\rbrack$
4. D.
   None

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1. A.
   $1.96 \times 10^{7}{Nm}^{- 2}$
2. B.
   $1.44 \times 10^{7}{Nm}^{- 2}$
3. C.
   $2.26 \times 10^{9}{Nm}^{- 2}$
4. D.
   $1.44 \times 10^{9}{Nm}^{- 2}$

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1. A.
   $3\widehat{i} + 4\widehat{j} - 2\widehat{k}$
2. B.
   $- 10\widehat{i} + 10\widehat{j} + 5\widehat{k}$
3. C.
   $10\widehat{i} + 5\widehat{j} - 10\widehat{k}$
4. D.
   $10\widehat{i} + \widehat{j} - 5\widehat{k}$

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