272255
A cube of a metal is given a positive charge Q. For this system, which of the following statements is true?
1 Electric potential at the surface of the cube is zero
2 Electric potential within the cube is zero
3 Electric field is normal to the surface of the cube
4 Electric field varies within the cube
Explanation:
(d) Surface of metallic cube is an equipotential surface. Therefore, electric field is normal to the surface of the cube.
NCERT Page-68/ N-62
Electrostatic Potentials and Capacitance
272256
Figure below shows a hollow conducting body placed in an electric field. which of the quantities are zero inside the body?
1 Electric field and potential
2 Electric field and charge density
3 Electric potential and charge density
4 Electric field, potential and charge density.
Explanation:
(b) Electric field is always zero inside a conductor. If there is any excess of charge on a hollow conductor it always resides on the outer surface of conductor. Therefore inside a hollow conductor there is no charge and hence charge density is zero.
272255
A cube of a metal is given a positive charge Q. For this system, which of the following statements is true?
1 Electric potential at the surface of the cube is zero
2 Electric potential within the cube is zero
3 Electric field is normal to the surface of the cube
4 Electric field varies within the cube
Explanation:
(d) Surface of metallic cube is an equipotential surface. Therefore, electric field is normal to the surface of the cube.
NCERT Page-68/ N-62
Electrostatic Potentials and Capacitance
272256
Figure below shows a hollow conducting body placed in an electric field. which of the quantities are zero inside the body?
1 Electric field and potential
2 Electric field and charge density
3 Electric potential and charge density
4 Electric field, potential and charge density.
Explanation:
(b) Electric field is always zero inside a conductor. If there is any excess of charge on a hollow conductor it always resides on the outer surface of conductor. Therefore inside a hollow conductor there is no charge and hence charge density is zero.
