Electric Charges
What is the SI unit of charge?
Coulomb
Electric field is a ________ quantity.
vector
When is the potential energy of an electric dipole in an electric field maximum?
θ = 180°
Capacitance _______ when a dielectric medium is placed between the capacitor plates.
increases
In conductors, relaxation time _______ with increase in temperature.
decreases
The device used to detect charge is ________.
Gold leaf electroscope.
When the source charge is positive, then the electric field is __________
radially outward.
An electric field is always _________ to the equipotential surface.
normal/perpendicular
Expression for Capacitance.
C = Q/V
Kirchoff's _________ Law deals with conservation of charge.
Current
What are the basic properties of charge?
Additivity
Quantisation
Conservation
When an electron is placed in an external electric field, it experiences a force ________ the direction of the applied field.
opposite
What is 1eV in J?
1.6 x 10-19
What does the capacitance of a capacitor depend on?
Size and shape/ Separation between conducting plates/Nature of Dielectric
In a Wheatstone's Network, when the bridge is balanced, what is zero?
Current through the galvanometer.
When a glass rod is rubbed with silk, _________
it loses electrons.
NC-1 is the SI unit of _________.
Electric field.
The electric potential inside a charged spherical shell of radius 5cm is 2V. What is the potential on the surface of this shell?
2V
Effective capacitance can be increased by connecting capacitors in __________ combination.
parallel
How is a Galvanometer converted into a Voltmeter?
By connecting a high resistance in series with the Galvanometer.
How many electrons constitute 1C of Charge?
6 x 1018
What happens to the electric flux through a spherical Gaussian surface if its radius is doubled?
Remains the same.
How much work is done in moving a charge of 20µC from infinity to a point where the potential is 10V?
200µJ
A 12 pF capacitor is connected to a 50 V battery. How much electrostatic energy is stored in it?
15,000 x 10-12 J
The current through a resistor wire increases by 1%. What is the percentage change in voltage?
1%