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Fill in the following blanks with suitable words:
(a) The lines of _____ round a straight-carrying conductor are in the shape of _____
(b) For a current-carrying solenoid, the magnetic field is like that of a _____
(d) The magnetic effect of a coil can be increased by increasing the number of _____, increasing the _____ or inserting an _____ core.
(e) If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a _____ pole.
(f) If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a _____ pole.
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 The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly.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:
A coil is connected to a galvanometer. When the N-pole of a magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
(a) the N-pole is removed?
(b) the 5-pole is inserted?
(c) the magnet is at rest in the coil?
State three ways of increasing the deflection on the galvanometer.
When the magnet shown in the diagram below is moving towards the coil, the galvanometer gives a reading to the right.
(i) What is the name of the effect being produced by the moving magnet?
(ii) State what happens to the reading shown on the galvanometer when the magnet is moving away from the coil.
(iii) The original experiment is repeated. This time the magnet is moved towards the coil at a great speed.
The wire in Figure below is being moved downwards through the magnetic field so as to produce induced current.
What would be the effect of:
(a) moving the wire at a higher speed?
(b) moving the wire upwards rather than downwards?
(c) using a stronger magnet?
(d) holding the wire still in the magnetic field?
(e) moving the wire parallel to the magnetic field lines?
Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if:
(i) a current is passed through coil B by plugging the key?
(ii) the current is stopped by removing the plug from the key?
An electric kettle rated as 1200 W at 220 V and a toaster rated at 1000 W at 220 V are both connected in parallel to a source of 220 V. If the fuse connected to the source blows when the current exceeds 9.0 A, can both appliances be used at the same time? illustrate your answer with calculations.