phy pt1

What is the angle between electric dipole moment and Electric Field , when the dipole is in stable equilibrium

• 0
• π/4
• π/2
• π

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 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

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

An electric dipole with electric dipole moment 4x10 -9 C m is aligned at 30 degree with the direction of uniform electric field of magnitude 5x10 4 N/C , calculate the magnitude of the torque acting on the dipole

• 10 -2 Nm
• 10 -4 Nm
• 10 -3 Nm
• 10 -5 Nm

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

• 
• 
• 
• 

What is the angle between electric dipole moment and Electric Field strength due to it on the axial line

• 0 degree
• 90 degree
• 180 degree
• None of these

Find the Electric Field intensity at the mid point of the line joining between two charges if two point charges +2µC and -4µC are placed 4cm apart in air

• 7x10 9 N/C
• 13.5 x10 7 N/C
• 27x10 7 N/C
• 72x10 7 N/C

A particle of mass m and charge q is released from rest in a uniform electric field intensity E , calculate K.E it attains after moving a distance S between plates

• qES
• qE
• ES
• None of these

The force between two charges in air is 200N , Calculate the force if the distance between them is increased by 50%

• 44.44N
• 24.44N
• 30N
• 88.88N