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प्रश्न
Write symbol and state function of following component in an electric circuit :
rheostat
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उत्तर
Rheostat symbol : 
It is used to control the current in the circuit.
संबंधित प्रश्न
State whether the resistance of filament of a bulb will decrease, remain unchanged or increase when it glows.
On increasing the resistance in a circuit, the current in it :
What do you understand by the term electric current?
State the relation between electric current; the number of electrons moving in a circuit and time in seconds.
Write SI unit of
Electric current,
The following figure shows a metal rod PQ mounted on an insulated stand. The cap of an uncharged electroscope touches one end Q of the metal rod. A negatively charged ebonite rod is brought near the other end P of the metal rod.
(a) What charge does the end P have?
(b) What charge does the end Q have?
(c) What charge does the cap of the electroscope have?
(d) What charge does the gold leaf have?
(e) Will the leaf diverge or collapse? Give reason.
(f) If the electroscope is now earthed, what charge does the metal rod have?
