Related InterviewSolutions

• In a potentiometer experiment it is found that no current passes through the galvanometer when the terminals of the cell are connected across `0.52 m` of the potentiometer wire. If the cell is shunted by a resistance of `5Omega` balance is obtained when the cell connected across` 0.4m` of the wire. Find the internal resistance of the cell.
• A potentiometer , with a wire of length 10 m, is connected to an accululator of steady voltage. A lenchlanche cell gives a null point at 7.5 m If the length of the potentiometer wire is increaseed by 1 m, find the new posistion of the null point.
• A metre bridge wire of resistance 3 `Omega` is connected to a cell of emf 2 V and internal rsistance 1 `Omega` Claculate the p.d cm of the wire What length of this wire will balace a fesh dry cell of emf 1.5 V?
• In a ten-wire potentiometer the first five wires are of radius r and the next five wires are of radius 2r.The wire is cnneceted to battery of steady voltage 2 V and negligible internal resistance What lenghts of this potentiometric arrangement will balacne the emf of (a) a dainell cell (emf=1.0 volt),(b) a Lenhlanche cell (emf=1.5 V) (c) an unknown cell of emf 1.8 V?
• A potentiometer having a wire of 4 m lengths is connected to the terminals of a battery with steady voltage. A leclanche cell has a null point at 1m. If the length of the potentiometer wire is increased by 1 m, the position of the null points is
• A 10 wire potentiometer has a resistance of 10` Omega` and is connected to fan accumulator of 2 V and negligible internal resistance.There are two resistance boxes `R_(1)` and `R_(2)` in series with the accumulator and one can have any intergral values of resistance from resistance boxes . A standard-cell of 1.018 V with a sensitive galvanometer in series with it is connected across `R_(1)`.How would you proceed with the above arrangement to obtain potential drop of 1 `mu` V per mm of the potentiometer wire? Calculate the vlue3s of `R_(1)` and `R_(2)` requried. What length of this potentiometer will balance the thermo emf of and copper couple at `300^(@)C` which develops 17`muV//^(0)C?`
• A five- wire potentiometer is connected to an accumulator emf 2.2 V and internal resistance 1 `Omega` The potentiometer wire has resistance of 1 `Omega` per metre. What is the maximum voltage that you can measure with this particular arrangement of the potentiometer? What length of this potentiometer will balance the emf of a Daniell cell(emf=1.18)? What resistance in series with the accumulatro will be required to balce this cell exactly at the centre of the last wire?