Charging by Conduction

Q. For the given arrangement, find the value of electric field at $C$.

1. $3\times {10}^3\text{N/C}$
2. $9\times {10}^3\text{N/C}$
3. $5\times {10}^3\text{N/C}$
4. $2\times {10}^3\text{N/C}$

Q. For the given charge configuration consisting of charges $+q_1$ and $+q_2$ such that $q_1>q_2$, the relation between flux through two imaginary spheres $S_1$ and $S_2$ as shown in the figure will be

1. ${\varphi }_{S_1}>{\varphi }_{S_2}$
2. ${\varphi }_{S_1}<{\varphi }_{S_2}$
3. ${\varphi }_{S_1}={\varphi }_{S_2}=0$
4. ${\varphi }_{S_1}={\varphi }_{S_2}\ne 0$

Q. WIRE OF LENGTH L AND RADIUS R FIXED AT ONE END AND FORCE APPLIED TO ANOTHER END PRODUCES EXTENSION L. THE EXTINSION PRODUCED IN ANOTHER

Q. An isolated metal sphere placed close to a Van de Graaff generator is touched. The net final charge on the sphere is that of the generator.

1. same as
2. opposite to
3. twice
4. zero times

Q. A charge $+q$ is kept inside the cavity present in a solid conducting sphere, as shown in figure.


If the sphere is given a charge $Q$, then total charge appearing on outer surface of sphere will be:

1. $Q+q$
2. $-(q+Q)$
3. $Q$
4. $Q-q$

Q. The figure shows a closed dotted surface which intersects a conducting uncharged sphere. If a positive charge is placed at the point $P$, the flux of the electric field through the closed surface

1. will become positive.
2. will become negative.
3. data insufficient
4. will remain zero.

Q. For the given arrangement, find the value of electric field at $C$.

1. $9\times {10}^3\text{N/C}$
2. $3\times {10}^3\text{N/C}$
3. $5\times {10}^3\text{N/C}$
4. $2\times {10}^3\text{N/C}$

Q. A charge \(Q\) is uniformly distributed over a large plastic sheet. The electric field at a point \(\text{P}\) close to the centre of the sheet is \(10~\text{N/C}\). If the plastic sheet is replaced by a copper sheet of the same geometrical dimensions and carrying the same charge \(Q\), the electric field at the point \(\text{P}\) will become

Q. For the given charge configuration consisting of charges $+q_1$ and $+q_2$ such that $q_1>q_2$, the relation between flux through two imaginary spheres $S_1$ and $S_2$ as shown in the figure will be

1. ${\varphi }_{S_1}>{\varphi }_{S_2}$
2. ${\varphi }_{S_1}={\varphi }_{S_2}=0$
3. ${\varphi }_{S_1}={\varphi }_{S_2}\ne 0$
4. ${\varphi }_{S_1}<{\varphi }_{S_2}$

Q.

Two charges of magnitudes: -$2\mathrm{q}$ and $+\mathrm{q}$ are located at points $(\mathrm{a},0)$ and $(4\mathrm{a},0)$, respectively. What is the flux through the sphere of radii $3\mathrm{a}$ with centre as the origin due to the charges?

Q. The figure shows a closed dotted surface which intersects a conducting uncharged sphere. If a positive charge is placed at the point $P$, the flux of the electric field through the closed surface

1. will remain zero.
2. data insufficient
3. will become negative.
4. will become positive.