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प्रश्न
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?
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उत्तर
(a) We will observe that the needle of the galvanometer instantly jumps to one side and just as quickly returns to zero, indicating a momentary current in coil connected to galvanometer.
(b) Introducing an iron bar in the tube, will increase the amount of induced current and the galvanometer will show a greater deflection.
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संबंधित प्रश्न
Define the unit of current.
Calculate the number of electrons constituting one coulomb of charge.
In which direction does conventional current flow around a circuit?
Why should the resistance of:
an ammeter be very small?
A car headlight bulb working on a 12 V car battery draws a current of 0.5 A. The resistance of the light bulb is:
(a) 0.5 Ω
(b) 6 Ω
(c) 12 Ω
(d) 24 Ω
The circuit diagram given below shows the combination of three resistors R1, R2 and R3:
Find :
(i) total resistance of the circuit.
(ii) total current flowing in the circuit.
(iii) the potential difference across R1.
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.
