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प्रश्न
Will the compass needle show deflection when the switch in the circuit shown by figure is closed?
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उत्तर
- No, because there is no source of electric current in this circuit, i.e., there is no battery.
- In the absence of current, the wire does not behave as a magnet, and hence, the compass needle will not show any deflection.
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संबंधित प्रश्न
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
What is Maxwell's corkscrew rule? For what purpose is if used?
The direction of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below:
What is the polarity of end X?
What is the polarity of end Y?
Name and state the rule which you have used to determine the polarities.
When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.
If S is kept closed, will the pointer:
(a) return to zero?
(b) stay over on the right?
(c) move to the left and stay there
(d) move to and fro until S is opened
Write the correct option by observing the figures.
(b) State whether the following statements are true or false:
(i) Magnetic poles exist in pairs.
What is that instrument which can detect the presence of electric current in a circuit?
Magnetic effect of current was discovered by ______.
Edison used a ______ wire coil is a vacuum glass and discovered the first electric bulb in 1879.
A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminium rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions:
- Why does the rod get displaced on passing current through it?
- State the rule that determines the direction of the force on the conductor AB.
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- If the U-shaped magnet is held vertically and the aluminium rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced?
- Name any two devices that use current carrying conductors and magnetic fields.
OR
Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.
