A downward force of 8.4N is exerted on a -8.8uC charge. What are the magnitude and direction of the electric field?

Question

anonymous · Answer

$$E=F/q$$

E= 8.4N/ -8.8 X 10^6 C=  

Upward

anonymous · Answer

what would be the unit?

anonymous · Answer

thank you very much

prakharluv · Answer

its unit will be Newton per coulomb

prakharluv · Answer

E=F/q
E=8.4 N/-8.8*10^6=-9.5*10^-7 N/C
-ve sign indicates the direction of Electric field is vertically upward.

anonymous · Answer

if the sign is positive the direction will be downward?

prakharluv · Answer

yup

anonymous · Answer

okay now i finally got the problem thank you. but this one is different: An electron is released from the rest in a uniform electric field and accelerates to the north at the rate of 115m/s^2. What are the magnitude and direction of electric field (E)?

prakharluv · Answer

we know that F=ma,
so on putting the value of m and a you will get force... and we know that the charge on electron...simply put all the values in eqn.
E=F/q=ma/q
you will get ur ans

anonymous · Answer

the acceleration would be_115m/s^2 right? what would be the mass? and our q would be the electrons charge?

prakharluv · Answer

mass of electron is 9.1*10^-31kg
and
charge on electron is -1.6*10^-19C

prakharluv · Answer

ans will be -6.5*10^-48 N /C

anonymous · Answer

this: (115m/s^2) ( 9.1*10^-31kg) divided by -1.6*10^-19C ?

prakharluv · Answer

yeah

anonymous · Answer

thank you so much

anonymous · Answer

how did you get this ( 9.1*10^-31kg)  ?

prakharluv · Answer

it is calculated value..you may learn it. u may also learn the charges and masses of another sub atomic particles

anonymous · Answer

is it constant? can u show me how did u get it?

prakharluv · Answer

yes it is constant... and for further information please concern with wikipedia here u will get ur ans...

anonymous · Answer

how did u get the exponent -48? i got -10 ?

anonymous · Answer

yes, -10

anonymous · Answer

how about this: What are the magnitude and direction of the electric force on an electron in a uniform electric field of strength 2360N/C that points due East.


the charge of electron is 1.6 x10^(-19) ? how come?
Force=electric field x charge
electric field=2360

prakharluv · Answer

what are u asking alfers101?

anonymous · Answer

The charge of an electron is always the same, it is a given ( and it should be negative though).   You have to plug in.  Pay attention to the units, write the units of the given.  You have to still determine the direction. 

F= qE;  plug in   ; and since it is negative it should be in the opposite direction.