Question

potentiometer wire length is 10 m having total resistance 10 ohm . if a battery of emf 2 volt and a rheostat are connected to it then the potential gradient is 20mV/m find the resistance imparted thrgh rheostat​

Answer 1

Explanation:

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Answer 2

Answer:

9.9ohm

Explanation:

k=20m v/m

v=K.L

v=20 *10

=200

I=V/R=200/10

=20A

I=E/R+R'

=2/10+r

20=2/10+R

R=99/10

9.9 ohm