Electric Charges and FieldsNEET Physics · Class 12 · NCERT Chapter 1

Two charges $q$ and $-q$ are placed $r$ apart. The force on each charge is:

The electric field at distance $r$ from a point charge $q$ is given by:

The electric field on the axis of a short dipole at distance $r$ is:

A charge $q$ is placed at the centre of a cube. The electric flux through one face is:

Inside a uniformly charged spherical shell, the electric field is:

The electric field at distance $r$ from an infinite line of linear charge density $\lambda$ is:

A flat surface of area $A$ is held at angle $\theta$ to a uniform field $E$. The flux through it is:

Two charges of $+q$ each are separated by $d$. A third charge $-q$ is placed at the midpoint. Net force on the $-q$:

The electric field of an infinite plane with surface density $\sigma$ is:

The torque on a dipole of moment $p$ in a uniform field $E$ at angle $\theta$ is:

A charge $Q$ is placed in a cube. If the side of the cube is doubled, the flux through the cube becomes:

Three charges $+q$, $+q$, $-q$ are placed at the corners of an equilateral triangle of side $a$. The force on $-q$ has magnitude:

Potential energy of a dipole at angle $\theta$ to a uniform field $E$ is:

The flux through a closed surface enclosing no charge is:

A solid sphere of radius $R$ has uniform charge density $\rho$. The field at distance $r$ inside ($r<R$) is:

Distance is doubled and charge is halved. The electric field becomes:

Two charges of $+5\mu \text{C}$ and $-5\mu \text{C}$ are placed 10 cm apart. Force between them:

The electric field on the equator of a short dipole at distance $r$ is:

Four equal positive charges are placed at the corners of a square. The net field at the centre is:

The flux through a hemispherical surface of radius $R$ in a uniform field $E$ (with field along the axis) is:

Outside a uniformly charged spherical shell of radius $R$ and total charge $Q$, the field at distance $r>R$ is:

Gauss's law $\oint \vec{E}\cdot d\vec{A}=q/{ϵ}_0$ is true for:

The Coulomb force between two charges in air is $F$. When placed in a medium of dielectric constant $K=4$, the force becomes:

A dipole of moment $p$ is placed perpendicular to a uniform field $E$. The torque on it is:

Two equal positive charges $q$ are placed at $(\pm a,0)$. The field at $(0,y)$ on the y-axis (with $y\ll a$) is approximately:

The electric field at distance $r$ from an infinite line is $E_1$. At distance $2r$ it becomes:

Two concentric shells of radii $R_1$ and $R_2$ ($R_1<R_2$) carry charges $Q_1$ and $Q_2$. The field at $r$ such that $R_1<r<R_2$ is:

Work done in rotating a dipole from $\theta =0$ to $\theta =90°$ in a uniform field $E$ is:

The unit of electric flux is:

Three charges $+q$, $+q$ are placed at $(0,0)$ and $(a,0)$. A test charge $+q_0$ is placed at $(a/2,0)$. Net force on $q_0$:

The SI unit of ${ϵ}_0$ is: