MHT CET202312 May 2023Evening ShiftPhysicsCurrent ElectricityActual
A potentiometer wire of length 4 ~m and resistance 5 is connected in series with a resistance of 992 and a cell of e.m.f. 4 ~V with internal resistance 3 . The length of 0.75 ~m on potentiometer wire balances the e.m.f. of
Options
- A4.00 mV
- B3.75 mV
- C3.00 mV
- D2.50 mV
Correct answer
B. 3.75 mV
Step-by-step solution
Total Resistance: R =992+5+3=1000 Voltage across 4 ~m wire: 5 995+5 4=0.02 ~V For one metre wire: 0.02 4 =0.005 ~V For 0.75 ~m wire: aligned 0.004 0.75 & =0.00375 & =3.75 mV aligned