Electrostatics

Question 1

Electric charge

Answer 1

Bodies with electric charge exert force on each other. This is electric interaction.

Question 2

Si unit of charge (q)

Answer 2

Coloumb (c)

Question 3

Can electric charge exist on its own?

Answer 3

No

Question 4

Cation

Answer 4

Positive ion

Question 5

Anion

Answer 5

Negative ion

Question 6

Charges create this around them selves and they exert force on each other through this.

Answer 6

Force field

Question 7

Structure of force field

Answer 7

Field lines

Question 8

Direction of field line gives…

Answer 8

… direction of force acting on a positive test charge

Question 9

Density of field lines gives the?

Answer 9

Magnitude of force

Question 10

What is true for a homogeneous electric field?

Answer 10

• force acting on a positive test charge has the same strength
• force has the same direction at each point
• field lines are parallel
• density of field lines are uniform

Question 11

Electric field between the plates of a capacitor is..

Answer 11

Homogeneous

Question 12

Electric dipole

Answer 12

Two charges of equal magnitude but opposite signs at a given distance (d). Electric field is Inhomogeneous. Strength of a dipole is given by the electric dipole moment (p)

Question 13

Definition of voltage (U)

Answer 13

The work needed to move a unit charge

Question 14

The voltage between two points equals..

Answer 14

The difference between their electric potentials

Question 15

Equipotential surface

Answer 15

The set of all points which have the same electric potential value.

Question 16

What is a capacitor?

Answer 16

An electrical component that is capable of storing electric charge and energy as well as creating homogenous electric field. Simplest form is the parallel plate capacitor.

Question 17

The cell membrane resembles a..

Answer 17

Capacitor

Question 18

The greater charge of the capacitor plates..

Answer 18

The greater the electric field strength as well as the voltage between them

Question 19

Capacitance

Answer 19

The electric charge of a capacitor divided by its voltage

Question 20

The capacitance is a measure for..

Answer 20

The charge-storing ability of a capacitor which gives the charge stored in a capacitor if its voltage is 1 V.
The greater the surface area of the plates, the stronger the fields and more charge required to maintain a given voltage.

Question 21

The electric energy stored in the capacitor.

Answer 21

The work (We) needed to charge the capacitor which is stored as energy in the electric field of the capacitor. The more more charge is transferred to the plates of the capacitor, the stronger the electric field and the greater the energy.