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प्रश्न
Tick(✓) the correct choice in the following:
When the length of a conductor is doubled the resistance of the conductor
will
पर्याय
Remain same
Double in value
Become four times
Become one fourth
Become half
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उत्तर
Double in value
APPEARS IN
संबंधित प्रश्न
Two resistors P and Q of the same material and length but of different thickness are connected in parallel to a battery. The cross- sectional area of P is twice that of Q. What is the ratio of
(a) The resistance of P to the resistance of Q?
(b) The current in P to the current in Q?
The circuit diagram (Fig.) shows a battery of e.m.f. 6 volts and internal
resistance of 0.8 Ω oonnected in series. Find the
(a) Current reoorded by the ammeter,
(b) P.d. across the terminals of the resistor B,
( c) Current passing through each of the resistors B, C and D, and
( d) P.d. across the terminals of the battery.
Explain with the help of a diagram how does 'short circuiting' occur in an electric kettle.
The circuit diagram in fig shows two coils of an insulated copper wire wound on a cardboard tube. G is a center zero galvanometer.
(a) Describe what will happen when th e swi tch K is cl osed for severa l
seconds and then opened again .
(b) What will be the effect of repeating the experiment with an iron placed in the tube?
Explain, why the potential difference across the terminals of a cell is more when the cell is not in use than it is when the cell is being used.
Problems for practice:
If 3A current flows through a circuit, then convert the current in terms of a milliampere.
For current to flow, one needs art open circuit.
What does the direction of current convey?
