A level physics help!!!! Electric fields

Hi
Could someone please help me with part b of this problem?

Calculate
a) the force between 2 charges of +1.4nC and +1.6nC on point conductors 40cm apart in air.
b)What size of charge on a third point conductor placed midway between the first two conductors would result in doubling of the magnitude of the force on the 1.4nC charge?

My answer for the first part was 1.2586x10^-7

Thanks in advance!!!

Reply 1

TSR Jessica

19

Sorry you've not had any responses about this. :frown:

Are you sure you've posted in the right place? :smile:

Here's a link to our subject forum which should help get you more responses if you post there. :redface:

Just quoting in Fox Corner so she can move the thread if needed :wizard:

Spoiler

Reply 2

langlitz

17

Original post by Skipper12345

Hi
Could someone please help me with part b of this problem?

Calculate
a) the force between 2 charges of +1.4nC and +1.6nC on point conductors 40cm apart in air.
b)What size of charge on a third point conductor placed midway between the first two conductors would result in doubling of the magnitude of the force on the 1.4nC charge?

My answer for the first part was 1.2586x10^-7

Thanks in advance!!!