02. COULOMB'S LAW
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Electric Charges and Fields

272134 The force between two small charged spheres having charges of $1\times {{10}^{-7}}C$ and $2\times {{10}^{-7}}C$ placed $20~cm$ apart in air is

1 $4.5\times {{10}^{-2}}~N$
2 $4.5\times {{10}^{-3}}~N$
3 $5.4\times {{10}^{-2}}~N$
4 $5.4\times {{10}^{-3}}~N$
NCERT Page-11 / N-7
Electric Charges and Fields

272135 Two charge $q$ and $-3q$ are placed fixed on $x$-axis separated by distance $d$. Where should a third charge $2q$ be placed such that it will not experience any force?

1 $\frac{d-\sqrt{3}d}{2}$
2 $\frac{d+\sqrt{3}d}{2}$
3 $\frac{d+3d}{2}$
4 $\frac{d-3d}{2}$
Electric Charges and Fields

272136 Two insulated charged metalic sphere $P$ and $Q$ have their centres separated by a distance of $60~cm$. The radii of $P$ and $Q$ are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is $3.2\times {{10}^{-7}}C$ is

1 $5.2\times {{10}^{-4}}~N$
2 $2.5\times {{10}^{-3}}~N$
3 $1.5\times {{10}^{-3}}~N$
4 $3.5\times {{10}^{-4}}~N$
NCERT Page-12 / N-7
Electric Charges and Fields

272137 If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in equilibrium then the value of $q$ is

1 $Q/2$
2 $-Q/2$
3 $Q/4$
4 $-Q/4$
NCERT Page-12 /N-7
NEET DIGITAL LIBRARY
Electric Charges and Fields

272134 The force between two small charged spheres having charges of $1\times {{10}^{-7}}C$ and $2\times {{10}^{-7}}C$ placed $20~cm$ apart in air is

1 $4.5\times {{10}^{-2}}~N$
2 $4.5\times {{10}^{-3}}~N$
3 $5.4\times {{10}^{-2}}~N$
4 $5.4\times {{10}^{-3}}~N$
NCERT Page-11 / N-7
Electric Charges and Fields

272135 Two charge $q$ and $-3q$ are placed fixed on $x$-axis separated by distance $d$. Where should a third charge $2q$ be placed such that it will not experience any force?

1 $\frac{d-\sqrt{3}d}{2}$
2 $\frac{d+\sqrt{3}d}{2}$
3 $\frac{d+3d}{2}$
4 $\frac{d-3d}{2}$
Electric Charges and Fields

272136 Two insulated charged metalic sphere $P$ and $Q$ have their centres separated by a distance of $60~cm$. The radii of $P$ and $Q$ are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is $3.2\times {{10}^{-7}}C$ is

1 $5.2\times {{10}^{-4}}~N$
2 $2.5\times {{10}^{-3}}~N$
3 $1.5\times {{10}^{-3}}~N$
4 $3.5\times {{10}^{-4}}~N$
NCERT Page-12 / N-7
Electric Charges and Fields

272137 If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in equilibrium then the value of $q$ is

1 $Q/2$
2 $-Q/2$
3 $Q/4$
4 $-Q/4$
NCERT Page-12 /N-7
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Electric Charges and Fields

272134 The force between two small charged spheres having charges of $1\times {{10}^{-7}}C$ and $2\times {{10}^{-7}}C$ placed $20~cm$ apart in air is

1 $4.5\times {{10}^{-2}}~N$
2 $4.5\times {{10}^{-3}}~N$
3 $5.4\times {{10}^{-2}}~N$
4 $5.4\times {{10}^{-3}}~N$
NCERT Page-11 / N-7
Electric Charges and Fields

272135 Two charge $q$ and $-3q$ are placed fixed on $x$-axis separated by distance $d$. Where should a third charge $2q$ be placed such that it will not experience any force?

1 $\frac{d-\sqrt{3}d}{2}$
2 $\frac{d+\sqrt{3}d}{2}$
3 $\frac{d+3d}{2}$
4 $\frac{d-3d}{2}$
Electric Charges and Fields

272136 Two insulated charged metalic sphere $P$ and $Q$ have their centres separated by a distance of $60~cm$. The radii of $P$ and $Q$ are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is $3.2\times {{10}^{-7}}C$ is

1 $5.2\times {{10}^{-4}}~N$
2 $2.5\times {{10}^{-3}}~N$
3 $1.5\times {{10}^{-3}}~N$
4 $3.5\times {{10}^{-4}}~N$
NCERT Page-12 / N-7
Electric Charges and Fields

272137 If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in equilibrium then the value of $q$ is

1 $Q/2$
2 $-Q/2$
3 $Q/4$
4 $-Q/4$
NCERT Page-12 /N-7
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Electric Charges and Fields

272134 The force between two small charged spheres having charges of $1\times {{10}^{-7}}C$ and $2\times {{10}^{-7}}C$ placed $20~cm$ apart in air is

1 $4.5\times {{10}^{-2}}~N$
2 $4.5\times {{10}^{-3}}~N$
3 $5.4\times {{10}^{-2}}~N$
4 $5.4\times {{10}^{-3}}~N$
NCERT Page-11 / N-7
Electric Charges and Fields

272135 Two charge $q$ and $-3q$ are placed fixed on $x$-axis separated by distance $d$. Where should a third charge $2q$ be placed such that it will not experience any force?

1 $\frac{d-\sqrt{3}d}{2}$
2 $\frac{d+\sqrt{3}d}{2}$
3 $\frac{d+3d}{2}$
4 $\frac{d-3d}{2}$
Electric Charges and Fields

272136 Two insulated charged metalic sphere $P$ and $Q$ have their centres separated by a distance of $60~cm$. The radii of $P$ and $Q$ are negligible compared to the distance of separation. The mutual force of electrostatic repulsion if the charge on each is $3.2\times {{10}^{-7}}C$ is

1 $5.2\times {{10}^{-4}}~N$
2 $2.5\times {{10}^{-3}}~N$
3 $1.5\times {{10}^{-3}}~N$
4 $3.5\times {{10}^{-4}}~N$
NCERT Page-12 / N-7
Electric Charges and Fields

272137 If a charge $q$ is placed at the centre of the line joining two equal charges $Q$ such that the system is in equilibrium then the value of $q$ is

1 $Q/2$
2 $-Q/2$
3 $Q/4$
4 $-Q/4$
NCERT Page-12 /N-7
NEET DIGITAL LIBRARY