They contain no electrons
Electrons do not flow easily through them
They are crystals
They have more number of electrons than the protons on their surface
The positive charges are transferred from rod to wool
The positive. charges are transferred from wool to rod
The negative charges are transferred from rod to wool
The negative charges are transferred from wool to rod
`text(E = 0 for a < r < b)`
`text(E = 0 for r < a)`
`E = q/(4piepsi_0 r)` for `a < r < b`
`E= q/(4piepsi_0a)` for `r < a`
` 1C`
`10 C`
`600 C`
`300 C`
air is being blown through the strands
static electric charges are being induced on the hair
mechanical energy is being transferred into heat energy
the gravitational attraction among the strands becomes smaller
doubled
halved
quadrupled
reduced to one-fourth
`V/2`
`4 V`
`V`
`2V`
super conductor
semiconductor
conductor
insulator
1 and 4
1 and 3
Only 3
2 and 3
the total energy of tile two spheres is conserved
the total charge on the spheres is conserved
botll the total energy and charge are conserved
the final potential is always the mean of the original potential of tile two spheres
outside the sphere
on its surface
inside the sphere
only at the centre
always positive
always negative
zero
either positive or negative
Semi-conductors
Super-conductors
Dielectrics
Resistive conductors
inductor
capacitor
Resistor
transformer
magnetic field at that point
gravitational field at that point
electrical field at that point
nuclear field at the point
similar charges of electricity rush towards each other and then get repelled
clouds strike against impurities in air and the friction burns up these impurities
strong opposite charges in different clouds break down the resistance offered by intervening air
water vapour produces electricity in the clouds
exist everywhere
exist in the immediate vicinity of positive charge
exist in the immediate vicinity of negative charge
are imaginary
`0.001 N`
`0.002 N`
`0.01 N`
`0.02 N`
less electrons than protons
less electrons than neutrons
less protons than electrons
less neutrons than protons
Constant voltage
Effective voltage
Average voltage
Peak voltage
zero
`10 V`
`200 V`
`500 V`