Electrostatics class 12

A point charge +q is placed at a distance d from an isolated conducting plane. The field at a point P on the other side of the plane is

• directed perpendicular to the plane and away from the plane

• directed perpendicular but towards the plane

• directed radially away from the point charge

• directed radially towards from the point charge

What will be the total flux through the faces of a cube with side of length a if charge q is placed at a corner of the cube

• q/4e_o

• q/8e_o

• q/2e_o

A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge

• remains a constant because the electric field is uniform

• increases because the charge moves along the electric field

• decreases because the charge moves along the electric field

• decreases because the charge moves opposite to the electric field

Equipotentials at great distance from a collection of charges whose total sum is not zero are approximately

• spheres

• planes

• paraboloids

• ellipsoids

A capacitance of 2μF is required in an electrical circuit across a pd of 1kV. A large number of 1μF capacitors are available which can withstand a pd of not more than 300V. The minimum number of capacitors required to achieve this is

• 24

• 32

• 2

• 16

Two particles A and B having charges 8*10^-6 C and -2*10^-6 C are held at a separation of 20 cm. Where should a third charged be placed so that it does not experience a net electric force?

• x=10 cm

• x=20 cm

• x=30 cm

• x= 15 cm

An electric dipole is placed in a uniform electric field. The net electric force on the dipole...

• Is always zero

• Depends on the orientation of the dipole

• Can never be zero

• Depends on the strength of the dipole

Which of the following labeled points is in the region with the strongest force of electric charge

• A
• B
• C
• D

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

What is the end result of charging by contact?

• Both object have the same charge, so they will attract one another

• Both object have the same charge, so they will repel one another

• Both object have the opposite charge, so they will attract one another

• Both object have the opposite charge, so they will repel one another

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-5

A pith ball has an electric charge +2q, and it feels a force F when placed a distance d from a second pith ball with an electric charge -q. When the second pith ball is charged to -3q, the force on the pith ball is ---.

• 6F

• 2F

• 3F

• F

Tags

NGSS.HS-PS2-4