a potentiometer wire of 10m length and 20 ohm resistance is connected in series with resistance r ohms and a - Physics - Current Electricity

Question

a potentiometer wire of 10m length and 20 ohm resistance is
connected in series with resistance r ohms and a battery of emf 2v
,negligible internal resistance potential gradient on the wire is 0
16 millivolt/centimeter then r is ohms(atb)?(ans=230) (current
electricity)

Ravi Gupta · Accepted Answer

Dear Student
Kindly find the answer of your asked query

R is the resistance of the wire = 20 ohmL is the potential meter length = 10 mE= 2 voltK =potential gradient = 0
16 milli volt/cm = 0 16×10-310-2=0
016 v/mcurrent across the wire is given by:I = ER+rpotential across the wire V = IR=ERR+rPotential gradient K = VL=ERR+rL=0
0162×2020+r=0 016×1020+r=40/0
16=250r=250-20=230 ohm

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a potentiometer wire of 10m length and 20 ohm resistance is connected in series with resistance r ohms and a battery of emf 2v ,negligible internal resistance. potential gradient on the wire is 0.16 millivolt/centimeter then r is.....ohms(atb)?(ans=230) (current electricity)