- dipole moment is a vector and its direction is?
from positive to negative pole
from negative to positive pole
it is a scalar and have no direction at all
none of these - 1C charge have number of electrons?
6,2510^19 6,2510^18
1.6*10^19 - ‘Fe’ is the electrostatic force between two electrons be ‘x’ times the gravitational force ‘Fg’ between them. Then order of ‘x’ is:?
10^36
10^38
10^42
none
4.How does the potential difference change with the effect of the dielectric when the battery is kept disconnected from the capacitor??
increases
decreases
remains same
none of these
5.The work done in carrying a positive charge from one point to another on an equi-potential surface.?
infinite
zero
negative
none of these
- The capacitance of a cylindrical capacitor can be increased by:?
increasing both inner and outer radius
increasing outer and decreasing inner radius
decreasing outer and increasing inner radius
none of these - The electric field due to an infinitely long straight uniformly charged wire at a distance r is proportional to?
r
r^2
1/r^2
none
8.Consider the radius of the earth is 6300 km (for simplicity of math here). The capacitance of the earth will be:?
zero
700F
infinity
none
- The capacitance of spherical capacitor can be increase by?
increasing the inner and outer radius
increasing inner and decreasing the outer radius
decreasing both inner and outer radius
none - on inserting dielectric material b/w plates of capacitor the effective electric field strength will be?
increased
decreased
remains same
none - the electric field due to dipole at a distance r at perpendicular bisector of the dipole is related to r?
1/r
1/r^2
1/r^3
none - The energy of a dipole will be minimum in external field when electric field and dipole moment vectors are?
perpendicular to each others
parallel to each others
antiparallel
none - The electric field inside the spherical volume charge distribution will be?
decreasing when moves towards surface of sphere
increasing when moves towards surface of sphere
will be zero
none - the electric field inside the body of conductor will be, when conductor is charged and isolated?
maximum
zero
uniform
none - the potential due a point charge, dipole and quadrupole will follow the trend at a distance r?
1/r^2 , 1/r^3, 1/r^2
1/r^4, 1/r^2 , 1/r^3,
1/r^2 , 1/r^4, 1/r^3, - The gradient of potential is a?
scalar
vector
none of these - As V=IR depicts ohm’s law E= rho J corresponds to?
drift velocity
microscopic form of ohm’s law
KVR - when current density in conductor increase drift speed should?
decrease
increase
as drift velocity is constant so it should remain same
none - when diameter of wire is doubled it resistivity will be?
4 times
becomes half
becomes one fourth
none of these - power delivered by a battery will be maximum if the load resistance will be?
greater than internal resistance of battery
equal to internal resistance of battery
none - if current is flowing through an external circuit terminal potential difference will be?
greater than emf
equal to emf
less than emf
none - the balancing length in potentiometer will be if two unknown sources are to compared?
more unknown emf less will be length
more unknown emf more will be length
none - when diameter of wire is doubled then drift velocity will be?
becomes double
reduces 4 times
reduces 2 times
none - temperature coefficient of carbon is?
positive
negative
may be both
none - yellow violet orange and gold find resistance for these colors?
4700 ohm with 5% tolerance
47000 ohm with 5% tolerance
47000 ohm with 10% tolerance
none - thermistor have temperature coefficients and convert changes in ….. into electrical signal?
positive, thermal
negative, thermal
none of these - the charge carriers in electrolytes are?
electrons and ions
+ve and -ve ions
only positive ions
free electrons - if 2,3,5 ohm resistors are connected in parallel what will be the equivalent resistance?
3 ohm
10 ohms
7 ohms
none - As kCR is law of conservation of charge, KVR is?
law of conservation of mass
law of conservation of energy
both
none - If the separation between the plates of a parallel plate capacitor is increased while the battery is connected, What will be the effect on the charge of the capacitor?
decreased
increased
remains same
none
