MEDIUM
JEE Main
IMPORTANT
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Which of the following statements is false?
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Important Questions on Current Electricity
HARD
JEE Main
IMPORTANT
A battery with an internal resistance of is connected across an infinite network, as shown in the figure. All ammeters and voltmeter are ideal.
Choose the correct statement.
MEDIUM
JEE Main
IMPORTANT
A potentiometer is set up to compare two resistances, as shown in the figure. The ammeter in the circuit reads when the two-way key is open. The balance point is at a length from when the two-way key is plugged in between , while the balance point is at a length from when the key is plugged in between . The ratio of two resistances is found to be
MEDIUM
JEE Main
IMPORTANT
In a meter bridge experiment resistances are connected as shown in the figure. Initially resistance and the neutral point is at from . Now an unknown resistance is connected in series to and the new position of the neutral point is at from . The value of unknown resistance is -
EASY
JEE Main
IMPORTANT
A uniform wire of length and radius has a resistance of . It is recast into a wire of radius . The resistance of new wire will be-
HARD
JEE Main
IMPORTANT
The figure shows three circuits and which are connected to a battery. If the powers dissipated by the configurations and are and respectively, then -
HARD
JEE Main
IMPORTANT
In the circuit shown, the resistance r is a variable resistance. If for , the heat generation in r is maximum then the value of is
MEDIUM
JEE Main
IMPORTANT
To know the resistance of a galvanometer by half deflection method, a battery of emf and resistance is used to deflect the galvanometer by angle . If a shunt of resistance is needed to get half deflection the , and are related by the equation:
EASY
JEE Main
IMPORTANT
The temperature dependence of resistance of and undoped in the temperature range is best described by
