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what are coherent sources why are coherent sources required to produce interference of light give an example of interference of light in everyday
verify biot-savart law use it to derive an expression for the magnetic field at the centre of a circular loop of radius r carrying a steady current i
draw a labelled diagram of a moving coil galvanometer verify the principle on which it works reduce an expression for the torque acting on a
define with the help of a schematic diagram the principle and working of a light emitting diode what criterion is kept in mind whereas choosing the
what is a digital signal describe the function of modem in data communication write two benefits of digital
in a plot of photoelectric current versus anode potential how does1 the saturation current varies with anode potential for incident radiations of
write any four characteristics of electromagnetic waves give two uses each of1 radio-waves2
explain the term resolving power of an astronomical telescope how does it get affected on1 enhancing the aperture of the objective lens2 enhancing
given below are two electric circuits a and bmeasure the ratio of power factor of the circuit b to the power factor of circuit
describe with the help of a labelled diagram the underlying principle and working of a step-up transformerwhy cannot such a device be used to step-up
write the mathematical relation for the resistivity of a material in terms of relaxation time number density and mass and charge of charge carriers
state kirchhoffs rules of current distribution in an electrical networkusing these rules verify the value of the current in the electric circuit
a parallel plate capacitor each with plate area a and separation d is charged to a potential dissimilarity v the battery used to charge it is then
deduce an expression for the electric potential because of an electric dipole at any point on its axis mention one contrasting feature of electric
explain electric flux write its si units a spherical rubber balloon carries a charge that is uniformly distributed over its surface as the balloon is
the electric field e because of a point charge at any point near it is explained as where q is the test charge and f is the force acting on it what
a cylindrical metallic wire is stretched to enhance its length by 5 measure the percentage change in its
write the relation for the force acting on a charge carrier q moving with a velocity by a magnetic field in vector notation using this relation
a convex lens of refractive index 15 has a focal length of 18 cm in air measure the change in its focal length when it is immersed in water of
the output of an or gate is linked to both the inputs of a nand gate draw the logic circuit of this combination of getes and write its truth
the radioactive isotope d decays according to the sequenceif the mass number and atomic number of d2 are 176 and 71 respectively what isi the mass
why should the material used for making permanent magnets have high coercivitywhat will be the values of input a and b for the boolean expressionwhy
an electron an alpha-particle and a proton have the similar kinetic energy which one of these particles has the main de-broglie
derive a mathematical expression for the force per unit length experienced by each of the two long current carrying conductors placed parallel to