Electric Charges and Fields Set-2

Q1. A cylinder of radius $r$ and length $l$ is placed in a uniform electric field parallel to the axis of the cylinder. The total flux for the surface of the cylinder is given by

Q2. Two parallel large thin metal sheets have equal surface charge densities $26.4 \times 10^{-12} \text{ C/m}^2$ of opposite signs. The electric field between these sheets is

Q3. A point charge situated at a distance '$r$' from a short electric dipole on its axis, experiences a force $\vec{F}$. If the distance of the charge is '$2r$', the force on the charge will be

Q4. The magnitude of the electric field due to a point charge at a distance of $4.0 \text{ m}$ is $9 \text{ N/C}$. From the same charged object the electric field of magnitude, $16 \text{ N/C}$ will be at a distance of

Q5. An electron experiences $\vec{F} = (1.6 \times 10^{-16} \text{ N}) \hat{i}$ in an electric field $\vec{E}$. The electric field is

Q6. Two charges $q_1$ and $q_2$ are placed at the centres of two spherical conducting shells of radii $r_1$ and $r_2$ respectively. The shells are arranged such that their centres are $d$ $[d > (r_1 + r_2)]$ apart. The force on $q_2$ due to $q_1$ is:

Q7. An electric dipole of length $2 \text{ cm}$ is placed at an angle of $30^\circ$ with an electric field of $2 \times 10^5 \text{ N/C}$. If the dipole experiences a torque of $8 \times 10^{-3} \text{ Nm}$, the magnitude of either charge of the dipole is,

Q8. Assertion (A): A negative charge in an electric field moves along the direction of the electric field.
Reason (R): On a negative charge a force acts in the direction of the electric field.

Q9. Assertion (A): Charge is quantized only integral number of electrons can be transferred.
Reason (R): There is no possibility of transfer of some fraction of electron.

Q10. Assertion (A): In a non-uniform electric field, a dipole will have translatory as well as rotatory motion.
Reason (R): In a non-uniform electric field, a dipole experiences a force as well as torque.

Q11. Assertion (A): Electrostatic field lines start at positive charges and end at negative charges. Reason (R): Field lines are continuous curves without any breaks and they form closed loop.

Q12. Assertion (A): Electrons moves away from a region of lower potential to a region of higher potential. Reason (R): An electron has a negative charge.

Q13. Assertion (A): All the charge in a conductor gets distributed on whole of its outer surface. Reason (R): In a dynamic system, charges try to keep their potential energy minimum.

Q14. Assertion (A): When a body acquires negative charge, its mass decreases. Reason (R): A body acquires positive charge when it gains electrons.

Q15. Assertion (A): Surface charge density of an irregularly shaped conductor is non-uniform. Reason (R): Surface density is defined as charge per unit area.