357298 For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75 \(cm\) from A when the key \(K\) is open. The second balance point is obtained at 60 \(cm\) from \(A\) when the key \(k\) is closed. Find the internal resistance \((in\,\Omega )\) of the battery \({\varepsilon _1}\)

357299 Assertion :
A potentiometer draws no current while measuring emf of a cell.
Reason :
Voltmeter is much better than a potentiometer for measuring emf of cell.

357300 In a potentiometer experiment of a cell of emf 1.25 \(V\) gives balancing length of 30 \(cm\). If the cell is replaced by another cell, balancing length is found to be 40 \(cm\). What is the emf of second cell ?

357301 Two cells having unknown emfs \({E_1}\) and \({E_2}\) \(\left( {{E_1} > {E_2}} \right)\) are connected in potentiometer circuit, so as to assist each other. The null point obtained is at 490cm from the higher potential end. When cell \({E_2}\) is connected, so as to oppose cell \({E_1}\) the null point is obtained at 90cm from the same end. The ratio of the emfs of two cells \(\left( {\frac{{{E_1}}}{{{E_2}}}} \right)\) is

357302 Assertion :
A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell.
Reason :
Potentiometer does not draw any current from the cell

357298 For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75 \(cm\) from A when the key \(K\) is open. The second balance point is obtained at 60 \(cm\) from \(A\) when the key \(k\) is closed. Find the internal resistance \((in\,\Omega )\) of the battery \({\varepsilon _1}\)

357299 Assertion :
A potentiometer draws no current while measuring emf of a cell.
Reason :
Voltmeter is much better than a potentiometer for measuring emf of cell.

357300 In a potentiometer experiment of a cell of emf 1.25 \(V\) gives balancing length of 30 \(cm\). If the cell is replaced by another cell, balancing length is found to be 40 \(cm\). What is the emf of second cell ?

357301 Two cells having unknown emfs \({E_1}\) and \({E_2}\) \(\left( {{E_1} > {E_2}} \right)\) are connected in potentiometer circuit, so as to assist each other. The null point obtained is at 490cm from the higher potential end. When cell \({E_2}\) is connected, so as to oppose cell \({E_1}\) the null point is obtained at 90cm from the same end. The ratio of the emfs of two cells \(\left( {\frac{{{E_1}}}{{{E_2}}}} \right)\) is

357302 Assertion :
A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell.
Reason :
Potentiometer does not draw any current from the cell

357298 For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75 \(cm\) from A when the key \(K\) is open. The second balance point is obtained at 60 \(cm\) from \(A\) when the key \(k\) is closed. Find the internal resistance \((in\,\Omega )\) of the battery \({\varepsilon _1}\)

357299 Assertion :
A potentiometer draws no current while measuring emf of a cell.
Reason :
Voltmeter is much better than a potentiometer for measuring emf of cell.

357300 In a potentiometer experiment of a cell of emf 1.25 \(V\) gives balancing length of 30 \(cm\). If the cell is replaced by another cell, balancing length is found to be 40 \(cm\). What is the emf of second cell ?

357301 Two cells having unknown emfs \({E_1}\) and \({E_2}\) \(\left( {{E_1} > {E_2}} \right)\) are connected in potentiometer circuit, so as to assist each other. The null point obtained is at 490cm from the higher potential end. When cell \({E_2}\) is connected, so as to oppose cell \({E_1}\) the null point is obtained at 90cm from the same end. The ratio of the emfs of two cells \(\left( {\frac{{{E_1}}}{{{E_2}}}} \right)\) is

357302 Assertion :
A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell.
Reason :
Potentiometer does not draw any current from the cell

357298 For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75 \(cm\) from A when the key \(K\) is open. The second balance point is obtained at 60 \(cm\) from \(A\) when the key \(k\) is closed. Find the internal resistance \((in\,\Omega )\) of the battery \({\varepsilon _1}\)

357299 Assertion :
A potentiometer draws no current while measuring emf of a cell.
Reason :
Voltmeter is much better than a potentiometer for measuring emf of cell.

357300 In a potentiometer experiment of a cell of emf 1.25 \(V\) gives balancing length of 30 \(cm\). If the cell is replaced by another cell, balancing length is found to be 40 \(cm\). What is the emf of second cell ?

357301 Two cells having unknown emfs \({E_1}\) and \({E_2}\) \(\left( {{E_1} > {E_2}} \right)\) are connected in potentiometer circuit, so as to assist each other. The null point obtained is at 490cm from the higher potential end. When cell \({E_2}\) is connected, so as to oppose cell \({E_1}\) the null point is obtained at 90cm from the same end. The ratio of the emfs of two cells \(\left( {\frac{{{E_1}}}{{{E_2}}}} \right)\) is

357302 Assertion :
A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell.
Reason :
Potentiometer does not draw any current from the cell

357298 For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75 \(cm\) from A when the key \(K\) is open. The second balance point is obtained at 60 \(cm\) from \(A\) when the key \(k\) is closed. Find the internal resistance \((in\,\Omega )\) of the battery \({\varepsilon _1}\)

357299 Assertion :
A potentiometer draws no current while measuring emf of a cell.
Reason :
Voltmeter is much better than a potentiometer for measuring emf of cell.

357300 In a potentiometer experiment of a cell of emf 1.25 \(V\) gives balancing length of 30 \(cm\). If the cell is replaced by another cell, balancing length is found to be 40 \(cm\). What is the emf of second cell ?

357301 Two cells having unknown emfs \({E_1}\) and \({E_2}\) \(\left( {{E_1} > {E_2}} \right)\) are connected in potentiometer circuit, so as to assist each other. The null point obtained is at 490cm from the higher potential end. When cell \({E_2}\) is connected, so as to oppose cell \({E_1}\) the null point is obtained at 90cm from the same end. The ratio of the emfs of two cells \(\left( {\frac{{{E_1}}}{{{E_2}}}} \right)\) is

357302 Assertion :
A potentiometer is preferred over that of a voltmeter for measurement of emf of a cell.
Reason :
Potentiometer does not draw any current from the cell