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To ice cream parlor

to play school

if it is magnitude of electric force then the charges will definitely move with initial acceleration of f/m bcoz resultant of frictional force and electrostatic force will be f in direction of electrostatic force
for preventing charges to move friction force shouid have a magnitude of 2f

2f it magnitude of electric field or magnitude of electric force????

but i will give u 2marks for this hard work

wrong we are taiking abt physics not geography dear this is not that eadge effect abt which red devil has asked i guess

He can not cross the river without undergoing some drift bcoz for this his own speed(4km/hr) shouid be greater then velocity of river(5km/hr)

His drift will be 150Km is he wish to cross river in minimum timr coz component of his velocity along river is 5Km/hr bcoz of river flowand time taken by him is 30hrs so his drift is 150Km

unit of speed are wrong i guess it isKm/hr

i m not getting what is (WAING SPEEDIS 1) here

anyway the minimum time to reach opposite bank shouid be 30hours when he will swim along perpendicular to the river his actual velocity will be resultant of his own velocity and that of the river which can be easily calculated using pythagorus theorem bcoz vectors are perpendicular

i can:t say xactly what it is but surely it is not related to leakage of charge as kislay has said and neither related to magnet i think
i think when distance b/w a point where we want to calculate electric field to the plate carrying charge(source of electric field like plate of capacitor) is not too small then the size of plate then the electric field at that point is different then as calculated from formula
E=sigma divided by absolent knot

electric potential at a point can be defined / calculated as / by calculating the amount of work done by external agent against the electrostatic force in carrying a unit +ve charge from very large distance(infinity) to tht point

3/10
i don"t like non indians

magnetic fields are actually just a hypothetical lines which give the direction of force on a hypothetical mono north pole they have no physical existance so no experiment has ever done to actually find it"s direction these lines are purely theoritical

electric field is conservative due to a static charge but non conservative due to a moving charge