Advertisements
Advertisements
Question
Answer the following question:
State the effect on the magnetic needle in Oersted’s experiment when:
(a) the current is passed through the wire.
(b) the current through the wire is increased
(c) the current through the wire is reversed.
Solution
- When a current is passed through the wire, the magnetic needle gets deflected.
- When the current through the wire is increased, the deflection of the magnetic needle increases.
- When the current through the wire is reversed, the magnetic needle is deflected in the opposite direction.
APPEARS IN
RELATED QUESTIONS
Will the compass needle show deflection when the switch in the circuit shown by figure is closed?
For the coil in the diagram below, when the switch is pressed:
(a) what is the polarity of end A?
(b) which way will the compass point then?
Which way does the wire in the diagram below tend to move?
A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the N-pole is removed?
If fuse of 250 mA, 500 mA, 1 A, 5 A and 10 A were available, which one would be the most suitable for protecting an amplifier rated at 240 V, 180 W?
Write the correct option by observing the figures.
(ii) Global warming is a desirable aspect of the intensified greenhouse effect.
Read the given passage and answer the following questions:
The home electrical connection consists of ‘live’, ‘neutral’ and ‘earth’ wires. The ‘live’ and the ‘neutral’ wires have potential difference of 220 V. The ‘earth’ is connected to ground. Due to a fault in the equipment or if the plastic coating on the ‘live’ and the ‘neutral’ wires gives a way the two wires come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measure.
- Name the two wires having potential difference of 220 V.
- What is a short circuit?
- Write the function of a fuse.
Name any two appliances which works on the phenomenon of magnetic effect of electric current.
A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid ____________.
If the key in the given arrangement is taken out (the circuit is made open) and magnetic field lines are drawn over the horizontal plane ABCD, the lines are ____________.
What is that instrument which can detect the presence of electric current in a circuit?
Magnetic effect of current was discovered by ______.
Unscramble the following words:
HTRCO
______ cells cannot be recharged after use.
An electric bell contains an ______, consisting of coils of insulated wire wound around
iron rods.
A wire with green insulation is usually the live wire of an electric supply.
