ON19 P12 Q34 Double Cell Resistance Equation | Oct/Nov 2019 | CIE A Level 9702 Physics

9702/12/O/N/19: Two cells with electromotive forces E1 and E2 and internal resistances r1 and r2 are connected to a resistor R as shown. The terminal potential difference across cell 1 is zero. Which expression gives the resistance of resistor R?
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[@nayciameerab3341]

I would rather lose a mark 🤡

[@adnansakeeb739]

I gave a like just to justify the pain u had to go through... this question is a headache

[@amnamalik6848]

You made it so much easier! Thank you so much for your efforts

[@ETphysics]

Glad it helped! :)

[@alanhaider1321]

not worth that 1 mark :(

[@maham22]

I think I spent 20-30 mins trying to do this question on my own, I surrender 😭

[@neev3026]

wow nobody will have carrot!

[@wanderwonder20]

miss why we took E1 for current.. we could take E2 also?

[@ETphysics]

Hmm would we have enough info about E2 to form a helpful equation for current?

[@mdhakeem9155]

Can you help me do Qs 34 9702/13/MJ/19

[@mdhakeem9155]

I don't understand this qs

[@ETphysics]

Check out the most recent video! ;)

[@Sandy-cm2th]

There must be an easier method this is worth just one mark :(

[@ETphysics]

Do share, if you have a shorter working! ;)