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A micro-ammeter has a resistance of and full scale range of . It can be used as a voltmeter and an ammeter of a higher range provided a resistance is added to it. Pick the correct range and resistance combination (s).
(a) range with resistance in series.
(b) range with resistance in series.
(c) range with resistance in parallel.
(d) range with resistance in parallel.

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Important Questions on Current Electricity
MEDIUM
JEE Main/Advance
IMPORTANT
Two cells of unequal emfs and and internal resistances and are joined as shown. and are the potentials at and , respectively.

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JEE Main/Advance
IMPORTANT
In the potentiometer arrangement shown, the driving cell has emf and internal resistance . The cell , whose emf is to be measured, has emf and internal resistance . The potentiometer wire is the potentiometer wire is long. If balance is obtained at the length

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JEE Main/Advance
IMPORTANT

HARD
JEE Main/Advance
IMPORTANT
In the circuit shown below, the key is pressed at time Which of the following statement(s) is (are) true?

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JEE Main/Advance
IMPORTANT

MEDIUM
JEE Main/Advance
IMPORTANT

EASY
JEE Main/Advance
IMPORTANT

MEDIUM
JEE Main/Advance
IMPORTANT
The figure shows an experimental plot discharging of a capacitor in an circuit. The time constant of this circuit lies between
