272251
A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V . The potential at a distance of 2 cm from the centre of the sphere is
1 zero
2 10 V
3 4 V
4 \(10 / 3 \mathrm{~V}\)
Explanation:
(b) Potential at any point inside the sphere \(=\) potential at the surface of the sphere \(=10 \mathrm{~V}\).
NCERT Page-61/N-56
Electrostatic Potentials and Capacitance
272252
The potential energy of a system of two charges is negative when
1 both the charges are positive
2 both the charges are negative
3 one charge is positive and other is negative
4 both the chargesare separated by infinite distance
Explanation:
(c) The potential energy is negative whenever there is attraction. Since a positive and negative charge attract each other therefore their energy is negative. When both the charges are separated by infinite distance, they do not attract each other and their energy is zero.
NCERT Page-61 i N-56
Electrostatic Potentials and Capacitance
272253
Figure shows a system of three positive charges placed at the vertices of an equilateral triangle. To decrease the potential energy of the system,
.
1 a positive chargeshould be placed at centroid.
2 a negative chargeshould be placed at centroid.
3 distance between the chargesshould be decreased.
4 it should be rotated by an angle of\(\frac{\pi}{2}\) radian.
Explanation:
(c) Potential energy decreases whenever there is attraction. A negative charge placed at centroid causes attraction.
272251
A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V . The potential at a distance of 2 cm from the centre of the sphere is
1 zero
2 10 V
3 4 V
4 \(10 / 3 \mathrm{~V}\)
Explanation:
(b) Potential at any point inside the sphere \(=\) potential at the surface of the sphere \(=10 \mathrm{~V}\).
NCERT Page-61/N-56
Electrostatic Potentials and Capacitance
272252
The potential energy of a system of two charges is negative when
1 both the charges are positive
2 both the charges are negative
3 one charge is positive and other is negative
4 both the chargesare separated by infinite distance
Explanation:
(c) The potential energy is negative whenever there is attraction. Since a positive and negative charge attract each other therefore their energy is negative. When both the charges are separated by infinite distance, they do not attract each other and their energy is zero.
NCERT Page-61 i N-56
Electrostatic Potentials and Capacitance
272253
Figure shows a system of three positive charges placed at the vertices of an equilateral triangle. To decrease the potential energy of the system,
.
1 a positive chargeshould be placed at centroid.
2 a negative chargeshould be placed at centroid.
3 distance between the chargesshould be decreased.
4 it should be rotated by an angle of\(\frac{\pi}{2}\) radian.
Explanation:
(c) Potential energy decreases whenever there is attraction. A negative charge placed at centroid causes attraction.
272251
A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V . The potential at a distance of 2 cm from the centre of the sphere is
1 zero
2 10 V
3 4 V
4 \(10 / 3 \mathrm{~V}\)
Explanation:
(b) Potential at any point inside the sphere \(=\) potential at the surface of the sphere \(=10 \mathrm{~V}\).
NCERT Page-61/N-56
Electrostatic Potentials and Capacitance
272252
The potential energy of a system of two charges is negative when
1 both the charges are positive
2 both the charges are negative
3 one charge is positive and other is negative
4 both the chargesare separated by infinite distance
Explanation:
(c) The potential energy is negative whenever there is attraction. Since a positive and negative charge attract each other therefore their energy is negative. When both the charges are separated by infinite distance, they do not attract each other and their energy is zero.
NCERT Page-61 i N-56
Electrostatic Potentials and Capacitance
272253
Figure shows a system of three positive charges placed at the vertices of an equilateral triangle. To decrease the potential energy of the system,
.
1 a positive chargeshould be placed at centroid.
2 a negative chargeshould be placed at centroid.
3 distance between the chargesshould be decreased.
4 it should be rotated by an angle of\(\frac{\pi}{2}\) radian.
Explanation:
(c) Potential energy decreases whenever there is attraction. A negative charge placed at centroid causes attraction.
