The fact that magnetic field is produced around a wire carrying a current, was discovered by
When the current is passing through the straight wire then, the associated magnetic field is
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When current is circular, the associated magnetic field is
When current flows clockwise in a loop, the polarity of its face is
When current flows anticlockwise in a loop the magnetic polarity of the face is
For a solenoid carrying a current I and having n turns per unit length, wrapped on a core of permeability, the correct expression for magnetic field intensity (2) is ?
Magnets having temporary magnetism are called
Direction of force acting on a current carrying conductor kept in a magnetic field is given by
The electric device which works on the phenomenon of force on a current carrying conductor in a magnetic field is
Electromagnetic induction was discovered by
Direction of induced current produced by motion of a conductor in a magnetic field is given by
In domestic electric circuits, fuse must be placed in series with
Electric and main switch is contained in a main board fitted usually
High powered electrical appliances are earthed to
In a three pin socket (shoe) the bigger hole is connected to
Due to overloading, the current in circuit becomes
Coming of live wire and neutral wire in direct contact causes
Melting point of material of a fuse wire must be
A high powered electric appliance has used inferior wires and is not earthed. It is a source of
Which of the following correctly describes the magnetic field near a long straight wire ?
The phenomenan of electromagnetic induction is
The device used for producing electric current is called a
At the time of short-circuit, the current in the circuit
An electron enters a magnetic field at right angles to it as shown in figure. The direction of force acting on the electron will be
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more then one correct answers)
3 videos|687 docs|659 tests
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3 videos|687 docs|659 tests
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