Find the net force on $-2\text{q}$.

Important Questions on Electric Charges and Fields

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 35

In MKS system of units, ${\text{ε}}_{\text{0}}$ is equal to

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 36

Three charges each of $5\times {10}^{-6} \mathrm{C}$ are placed at three corners of an equilateral triangle of side $10\mathrm{ }\mathrm{c}\mathrm{m}$. The force in $\mathrm{N}$ exerted on another charge of $1 \text{μC}$ placed at the centre of the triangle in newton will be:

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 37

Three equal charges, each having a magnitude of $2.0\times {10}^{-6}C,$ are placed at the three corners of a right angled triangle of side 3cm, 4cm and 5cm. The force (in magnitude) on the charge at the right angled corner is

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 38

The charge on two spheres are $+7 \mu C$ and $-5 \mu C$ respectively. They experience a force $F$. If each of them is given an additional charge of $-2 \mu C,$ then the new force of attraction will be

EASY

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 39

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, 

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 40

It is required to hold equal charges $q$ in equilibrium at the corners of a square. What charge when placed at the center of the square will do this?

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IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 41

Three identical charges each $2\mu C$ lie at the vertices of a right-angled triangle as shown in the figure. Forces on the charge at $B$ due to the charges at $A$ and $C$ respectively are $F_1$ and $F_2$. The angle between their resultant force and $F_2$ .

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CUET (UG)

IMPORTANT

Achieve CUET (UG) Physics Practice Book>Chapter 1 - Electric Charges and Fields>Exercise>Q 42

A point charge $\text{+}\mathit{\text{Q}}$ is placed at the centroid of an equilateral triangle. When a second charge $\text{+}\mathit{\text{Q}}$ is placed at a vertex of the triangle, the magnitude of the electrostatic force on the central charge is $4\mathrm{ }\mathrm{N}$ . What is the magnitude of the net force on the central charge when a third charge $\text{+}\mathit{\text{Q}}$ is placed at another vertex of the triangle?