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Anurag Verma

Jul 28, 2014

#### A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?



In the case of a hollow metal sphere, the electric field inside the shell is zero. This means that the potential inside the shell is constant. Therefore the pot...

Anurag Verma

Jul 28, 2014

#### Two materials Si and Cu are cooled from 300 K to 60 K. What will be the effect on their resistivity ?



Two materials Si and Cu are cooled from 300 K to 60 K. What will be the effect on their resistivity?
The specific resistivity of copper (metal) wil...

Letusknowwhy

May 15, 2014

#### What do you mean by the conservative nature of electric field?



An electric field is said to be conservative, if the work done by the electric force in moving a charge particle from one point to another point depends only on the initial and fin...

Shivansh Rawat

May 8, 2014

#### Draw figures and write the properties of equipotential surfaces?



1.        Equipotential surfaces never cross each other.
2.        Equipotential surfaces give the direction o...

Misha Jain

Oct 13, 2014

#### A conducting sphere of radius 10 cm is charged with 10 Î¼C. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are separated, then surface density of charges on the spheres will be in the ratio of



When the two conducting spheres touch each other there will be a flow of charge until they both have the same potential.
Let R1 and R2 be the radii of spheres 1 and 2, respectively.  Let Q1 and Q2 b...

Anurag Verma

Aug 9, 2014

#### A parallel plate capacitor is charged by a battery, which is then disconnected. A dielectric slab is then inserted in the space between the plates. Explain what changes, if any, occur in the values of: (i) capacitance (ii) potential difference between the plates (iii) electric field between the plates (iv) the energy stored in the capacitor .



(i) The capacitance increases as the dielectric constant K > 1.

(ii) Potential difference V = Q/C.  As C increases and Q remains the same since the battery is disconnected, the p.d...

Letusknowwhy

May 15, 2014

#### How does the electric field and electric potential vary with distance from a point charge?



Variation of electric feild and potential with distance depends on which type of conductor you are using     ...

Anurag Verma

Jul 28, 2014

#### Net capacitance of three identical capacitors in series is 1 Î¼F . What will be their net capacitance if connected in parallel. Find the ratio of energy stored in the two configuration if they are both connected to the same source .



Altaf Hussain Shaikh Ahmed

Apr 7, 2015

#### In a region of constant potential (a) the electric field is uniform (b) the electric field is zero (c) there can be no charge inside the region. (d) the electric field shall necessarily change if a charge is placed outside the region.



Options (B) and (C). In the region of constant electric potential, electric field is zero so there is no charge inside the region.

Altaf Hussain Shaikh Ahmed

Mar 20, 2015

#### State and prove gauss theorem in electrostatics.



https://www.learnnext.com/CBSE-Class-XII-Physics/Lesson-Gauss--Law.htm

Anurag Verma

Jul 28, 2014

#### A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere?



In the case of a hollow metal sphere, the electric field inside the shell is zero. This means that the potential inside the shell is constant. Therefore the pot...

Anurag Verma

Jul 28, 2014

#### Two materials Si and Cu are cooled from 300 K to 60 K. What will be the effect on their resistivity ?



Two materials Si and Cu are cooled from 300 K to 60 K. What will be the effect on their resistivity?
The specific resistivity of copper (metal) wil...

Letusknowwhy

May 15, 2014

#### What do you mean by the conservative nature of electric field?



An electric field is said to be conservative, if the work done by the electric force in moving a charge particle from one point to another point depends only on the initial and fin...

Shivansh Rawat

May 8, 2014

#### Draw figures and write the properties of equipotential surfaces?



1.        Equipotential surfaces never cross each other.
2.        Equipotential surfaces give the direction o...

Misha Jain

Oct 13, 2014

#### A conducting sphere of radius 10 cm is charged with 10 Î¼C. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the spheres are separated, then surface density of charges on the spheres will be in the ratio of



When the two conducting spheres touch each other there will be a flow of charge until they both have the same potential.
Let R1 and R2 be the radii of spheres 1 and 2, respectively.  Let Q1 and Q2 b...

Anurag Verma

Aug 9, 2014

#### A parallel plate capacitor is charged by a battery, which is then disconnected. A dielectric slab is then inserted in the space between the plates. Explain what changes, if any, occur in the values of: (i) capacitance (ii) potential difference between the plates (iii) electric field between the plates (iv) the energy stored in the capacitor .



(i) The capacitance increases as the dielectric constant K > 1.

(ii) Potential difference V = Q/C.  As C increases and Q remains the same since the battery is disconnected, the p.d...

Letusknowwhy

May 15, 2014

#### How does the electric field and electric potential vary with distance from a point charge?



Variation of electric feild and potential with distance depends on which type of conductor you are using     ...

Anurag Verma

Jul 28, 2014

#### Net capacitance of three identical capacitors in series is 1 Î¼F . What will be their net capacitance if connected in parallel. Find the ratio of energy stored in the two configuration if they are both connected to the same source .



Altaf Hussain Shaikh Ahmed

Apr 7, 2015

#### In a region of constant potential (a) the electric field is uniform (b) the electric field is zero (c) there can be no charge inside the region. (d) the electric field shall necessarily change if a charge is placed outside the region.



Options (B) and (C). In the region of constant electric potential, electric field is zero so there is no charge inside the region.

Altaf Hussain Shaikh Ahmed

Mar 20, 2015

#### State and prove gauss theorem in electrostatics.



https://www.learnnext.com/CBSE-Class-XII-Physics/Lesson-Gauss--Law.htm

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