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Physics Unit 4 Multiple choice question

Two electrons x and y travel at right angles to a uniform magnetic field. X experiences a magnetic force, Fx and Y experiences magnetic force Fy.

What is the ratio Fx/Fy if the kinetic energy of X is half that of Y ?

a) 1/4
b) 1/2
c) 1/root 2
d) 1

Reply 1

TSR Jessica

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:

You can also find the Exam Thread list for A-levels here and GCSE here. :dumbells:

Just quoting in Puddles the Monkey so she can move the thread if needed :h:

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Reply 2

16characterlimit

C, half of 1/2mv^2 with constant mass (as both electrons) means that velocity is reduced by a factor of 1/sqrt(2)

Reply 3

civ1

Original post by 16characterlimit

C, half of 1/2mv^2 with constant mass (as both electrons) means that velocity is reduced by a factor of 1/sqrt(2)

but it says the ratio of the forces not the ratio of the velocity

Reply 4

16characterlimit

Original post by civ1

but it says the ratio of the forces not the ratio of the velocity

My mistake, luckily since F=Bqv

Fx/Fy = Bqv/Bq(v/sqrt(2)) = 1/sqrt(2)

So still C.

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Physics Unit 4 Multiple choice question

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