" 41) An ideal voltmeter has "1" point "

A : potentiometer can act as an ideal voltmeter . R : An idea, voltmeter has infinite resistance .

A : potentiometer can act as an ideal voltmeter . R : An idea, voltmeter has infinite resistance .

[" A non-ideal voltmeter and a non-ideal ammeter are connected as shown in the figure.The reading of "],[" the voltmeter is "20V" and that of the ammeter is "4A" .The value of "R" is : "]

[" A non-ideal voltmeter and a non-ideal ammeter are connected as shown in the figure.The reading of "],[" the voltmeter is "20V" and that of the ammeter is "4A" .The value of "R" is : "],[qquad (A)/(0)]

Assertion : In the circuit shown in figure ammeter and voltmeter are non-ideal when positions of ammeter and voltmeter are changed, reading of ammeter will increase while of voltmeter will decrease. Reason : Resistance of an ideal ammeter is zero while that of an ideal voltmeter is infinite.

Assertion : In the circuit shown in figure ammeter and voltmeter are non-ideal. Why positions of ammeter and voltmeter are changed, reading of ammeter will increase while of voltmeter will decrease. Reason : Resistance of an ideal ammeter is zero while that of an ideal voltmeter is infinite.

Reading of an ideal voltmeter in the circuit below is