Distinguish between electric charge and mass.

Important Questions on Electric Charges and Field

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 5

What is an electric line of force? What is its importance?

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 6

Represent the surface distribution of charge for a square metal plate by using dashes in such a way that the greater the surface density of charge, the farther away are the dashes from the plate.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 7

Two point electric charges of unknown magnitude and sign are placed a distance '$d$' apart. The electric field intensity is zero at a point, not between the charges but on the line joining them. Write the essential conditions for this to happen.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 8

The electric field $E$ due to a point charge at any point is defined as $\underset{q\to 0}{lim} \frac{F}{q}$, where $q$ is the test charge and $F$ is the force acting on it. What is the physical significance of $\underset{q\to 0}{lim}$ in this field expression? Draw the electric lines of a point charge $Q$ when (i) $Q>0$ and (ii) $Q<0$.

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 9

A charge $Q$ located at a point $\overrightarrow{r}$ is in equilibrium under the combined electric field of three charges $q_1, q_2, q_3$. If the charges $q_1, q_2$ are located at points $\overrightarrow{r_1}$ and $\overrightarrow{r_2}$ respectively, find the direction of the force on $Q$, due to $q_3$ in terms of $q_1, q_2, \overrightarrow{r_1}, \overrightarrow{r_2}$ and $\overrightarrow{r}$.

MEDIUM

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 10

Two point charges $+q$ and $-q$ are placed a '$d$' distance apart. Draw the line on which the resultant field is parallel to the line joining the two charges.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 11

Draw a diagram to show lines of force in a plane containing two equal point charges of opposite sign separated by a small distance. Giving reason, indicate on the diagram a point where a small positive charge experiences a force parallel to the line joining the two charges.

EASY

12th CBSE

IMPORTANT

New Simplified Physics (Vol 1) For Class 12>Chapter 1 - Electric Charges and Field>SHORT ANSWER CONCEPTUAL PROBLEMS>Q 12

What is meant by the statement that the electric field of a point charge has spherical symmetry whereas that of an electric dipole is cylindrically symmetric?