gauss theorem

Calculate the total charge enclosed by closed surface if the number of electric lines of force entering it is 10,000 and leaving 20,000.

• 8.85x10-8 C
• 8.85x10 -7 C
• 8.85x10 -9 C
• 8.85x10 -10 C

A box encloses an electric dipole consisting of charge 5µC and -5µC and of length 10 cm. what is the total electric flux through the box?

• 3.39x10 5Nm2C-1
• 5.39x105Nm2C-1
• 3.39x105Nm2C-1
• zero

An infinite line charge produces a field of 9x10 4 N/C at a distance of 5cm calculate linear charge density ?

• 5.5x10-7C m
• 2.5x10-7C m
• 7.5x10-7C m
• 6.5x10-7C m

Gaussian surface cannot pass through discrete charge because

• Its an imaginary surface
• Electric field is not defined at the location of charge
• Electric field is normal at that point
• Electric field is tangential at that point

The Gaussian surface needed for calculating the electric field due to charge distribution is

• Any surface around the charge distribution
• Only spherical surface
• Any closed surface around the charge
• Only cylindrical surface

Which of the following graph represent the variation of electric field intensity E(r) due to charged spherical shell of radius R with distance r from its centre

• 
• 
• 
• 

A imaginary Gaussian surface shown in figure: The Electric Field on surface will be

• due to q 1 and q 2 only
• due to q 2 only
• zero
• due to all the charges

A point charge of 10-7 C is situated at centre of cube of 1m side. Calculate the electric flux through its surface ?

• 1.13x10 4 Nm 2C-1
• 2.13x10 4 Nm2C-1
• 3.13x10 4Nm 2C-1
• 7.13x10 4Nm 2C-1

An electric charge q is placed at the centre of a cube of side a. The electric flux on one of its faces will be

• q/6 ε0
• q/ε0 a2
• q/4π ε0 a2
• none of these

If the amount of electric flux entering and leaving a closed surface are Ø and Ø respectively. What is the electric charge inside the surface?

• 24
• zero
• 10
• none of these