[" De fine diel ectice'c Con oftanf of "],[" a medium in tert ma oq faree "],[" besn electric charges."]

A closed conducting sphere is positively charged such that the surface charge density is 17.7xx10^(-12)C//m^(2) . If the dielectric constant of the medium surrounding the conductor is 100, then electric field intensity at a point just outside it will be

Which is not the characteristic of hydrophobic sols? a. They are highly susceptible to coagulation by addition of electrolytes. b. They have nearly the same surface tension and viscosity as that of dispersion medium. c. Their stability is due to both electric charge and salvation of the particles. d. Sol particles can be seen under ultramicroscope.

Which is not the characteristic of hydrophobic sols? a. They are highly susceptible to coagulation by addition of electrolytes. b. They have nearly the same surface tension and viscosity as that of dispersion medium. c. Their stability is due to both electric charge and salvation of the particles. d. Sol particles can be seen under ultramicroscope.

A conductor having a charge density of 120 mu C/m^2 is surrounded by a medium of dielectric constant 4 . The electric intensity at a point very near the charged conductor is

Fuel cells are the commercial cells which converts the chemical energy into electrical energy and differ from the normal batteries since fuel cells require constant source of fuel and oxygen to obtain electric current. However, they can be used to produce electricity as long as the supply of fuel and oxygen is maintained. All fuel cells consist of an anode and a cathode and an electrolyte which allows charges to move between the two sides of the fuel cell. Electrons are drawn from anode to cathode through an external circuit and hence produce direct current electricity. Under practical cases, efficient of fuel cell is around 40-60% and in some cases it may be as high as 85-90% Some common examples of fuel cell are diect methanol fule cell (DMFC), Direct Borohydride fuel cell (DBFC), alkaline fuel cell (AFC) and others.While in DMFC the electrolyte is an ionomer (proton exchange monomer) in case of AFC and DBFC the electrolyte is an aqueous alkaline solution. Also, in case of DBFC the borohydride gets oxidised to metaborate, In all the above three cases, at cathode reduction of O_(2) (gas) occurs in a medium controlled by the electrolyte. Based on this information answer the electrolyte. Based on the information answer the question that follow : Data {:(DeltaH_(f)^(@)CH_(3)OH(l)=-230kJ//"mole",,DeltaH_(f)^(@)CO_(2) =-390kJ//"mole"),(Delta_(f)^(@)H_(2)O(l) = - 285 kJ//"mole",,S_(mH_(2)O(l))^(@)=130J//K "mole"),(S_(mCO_(2(g))) = 210 J//K "mole",S_(mH_(2)O(l))^(@) = 110 J//K "mol"),(S_(mO_(2(g)))=206J//K "mole",,S_(mH_(2(g))) = 130J//K "mole"),("All data at" 300 K.,1/F = 10^(-5)C^(-1)):} Which of the following information is correct about DMFC at 300 K if mathanol liquid is used as a fuel in DMFC ?

Fuel cells are the commercial cells which converts the chemical energy into electrical energy and differ from the normal batteries since fuel cells require constant source of fuel and oxygen to obtain electric current. However, they can be used to produce electricity as long as the supply of fuel and oxygen is maintained. All fuel cells consist of an andoe and a cathode and an electrolyte which allows charges to move between the two sidez of the fuel cell. Electrons are drawn from anode to cathode through an external circuit and hence produce direct current electricity. Under practical cases, efficient of fuel cell is around 40-60% and in some cases it may be as high as 85-90% Some common examples of fuel cell are diect methanol fule cell (DMFC), Direct Borohydride fuel cell (DBFC), alkaline fuel cell (AFC) and others.While in DMFC the electrolyte is an ionomer (proton exchange monomer) in case of AFC and DBFC the electrolyte is an aqueous alkaline solution. Also, in case of DBFC the borohydride gets oxidised to metaborate, In all the above three cases, at cathode reduction of O_(2) (gas) occurs in a medium controlled by the electrolyte. Based on this information answer the electrolyte. Based on the information answer the question that follow : Data {:(DeltaH_(f)^(@)CH_(3)OH(l)=-230kJ//"mole",,DeltaH_(f)^(@)CO_(2) =-390kJ//"mole"),(Delta_(f)^(@)H_(2)O(l) = - 285 kJ//"mole",,S_(mH_(2)O(l))^(@)=130J//K "mole"),(S_(mCO_(2(g))) = 210 J//K "mole",S_(mH_(2)O(l))^(@) = 110 J//K "mol"),(S_(mO_(2(g)))=206J//K "mole",,S_(mH_(2(g))) = 130J//K "mole"),("All data at" 300 K.,1/F = 10^(-5)C^(-1)):} If in DBFC it is known that sodium borohydride is taken as a fuel than which of the following reaction wil be occuring at approprite electrode in the DBFC ?

Fuel cells are the commercial cells which converts the chemical energy into electrical energy and differ from the normal batteries since fuel cells require constant source of fuel and oxygen to obtain electric current. However, they can be used to produce electricity as long as the supply of fuel and oxygen is maintained. All fuel cells consist of an andoe and a cathode and an electrolyte which allows charges to move between the two sidez of the fuel cell. Electrons are drawn from anode to cathode through an external circuit and hence produce direct current electricity. Under practical cases, efficient of fuel cell is around 40-60% and in some cases it may be as high as 85-90% Some common examples of fuel cell are diect methanol fule cell (DMFC), Direct Borohydride fuel cell (DBFC), alkaline fuel cell (AFC) and others.While in DMFC the electrolyte is an ionomer (proton exchange monomer) in case of AFC and DBFC the electrolyte is an aqueous alkaline solution. Also, in case of DBFC the borohydride gets oxidised to metaborate, In all the above three cases, at cathode reduction of O_(2) (gas) occurs in a medium controlled by the electrolyte. Based on this information answer the electrolyte. Based on the information answer the question that follow : Data {:(DeltaH_(f)^(@)CH_(3)OH(l)=-230kJ//"mole",,DeltaH_(f)^(@)CO_(2) =-390kJ//"mole"),(Delta_(f)^(@)H_(2)O(l) = - 285 kJ//"mole",,S_(mH_(2)O(l))^(@)=130J//K "mole"),(S_(mCO_(2(g))) = 210 J//K "mole",S_(mH_(2)O(l))^(@) = 110 J//K "mol"),(S_(mO_(2(g)))=206J//K "mole",,S_(mH_(2(g))) = 130J//K "mole"),("All data at" 300 K.,1/F = 10^(-5)C^(-1)):} If in AFC, H_(2)(g) is used as anode then identify the options which are not correct for AFC.

the number of electric field lines leaving the positive 0.5 C charge placed in the medium of dielectric constant K = 10 are .......

Electric intensity at a point outside a charged spherical conductor surrounded by air is 6 N/C. If the space around the conductor is filled with a medium of dielelctric constant 3, then the electric intensity at the same point will be