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Fill in the following blank with suitable words:
The magnetic effect of a coil can be increased by increasing the number of ........... increasing the ........... or inserting an ........... core.
Concept: undefined >> undefined
Fill in the following blank with suitable words:
If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.
Concept: undefined >> undefined
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Fill in the following blank with suitable words:
If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a ........... pole.
Concept: undefined >> undefined
Describe some experiment to show that the magnetic field is associated with an electric current.
Concept: undefined >> undefined
What is Maxwell's corkscrew rule? For what purpose is if used?
Concept: undefined >> undefined
If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:
(a) west pole
(b) south pole
(c) north pole
(d) east pole
Concept: undefined >> undefined
The magnetic effect of current was discovered by:
(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday
Concept: undefined >> undefined
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?
Concept: undefined >> undefined
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.
Concept: undefined >> undefined
Name one device which works on the magnetic effect of current.
Concept: undefined >> undefined
What device reverses the current?
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Which way does the wire in the diagram below tend to move?
Concept: undefined >> undefined
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
Concept: undefined >> undefined
The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was ______.
Concept: undefined >> undefined
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?
Concept: undefined >> undefined
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 S-pole is inserted?
Concept: undefined >> undefined
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 magnet is a rest in the coil?
Concept: undefined >> undefined
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?
Concept: undefined >> undefined
How should the electric lamps in a building be connected so that the switching on or off in a room has no effect on other lamps in the same building?
Concept: undefined >> undefined
Why are metals called electropositive elements whereas non-metals are called electronegative elements?
Concept: undefined >> undefined
