EASY
Earn 100
Distinguish between Uniform magnetic field and Non- uniform magnetic field?
Important Questions on Magnetism and Magnetic Effects of Electric Current
EASY
A magnetic field cannot
EASY
What is the importance of Oersted's experiment?
MEDIUM
An electron is moving along direction with a velocity of . It enters a region of uniform electric field of pointing along direction. The magnitude and direction of the magnetic field set up in this region such that the electron keeps moving along the x direction will be:
EASY
The magnetic induction field has the dimensions of
MEDIUM
What is the magnetic field at point if wire (infinite) is bent at and current is flowing through it in opposite direction at point O:
MEDIUM
What is uniform and non-uniform magnetic fields?
EASY
A coil of N turns, A area is placed in uniform transverse magnetic field B. If it is turn through 180º about its one of the diameter in 2 seconds. Find rate of change of magnetic flux through the coil.
EASY
A square cube of side ’a’ is placed in uniform magnetic field B’. Find magnetic flux through each face of the cube.
MEDIUM
An ideal solenoid having 5000 turns/m has an aluminium core and carries a current of 5A. If , then the magnetic field developed at centre will be
MEDIUM
Assertion: The basic difference between an electric line and the magnetic lines of force is that the former does not form any closed loops and the latter forms continuous loops.
Reason: Electric field is conservative whereas magnetic field is non-conservative.
EASY
The earth’s magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably?
EASY
Let and denote electric and magnetic fields in a frame and and in another frame moving with respect to at a velocity . Two of the following equations are wrong. Identify them.
MEDIUM
The magnetic field inside a solid conducting long wire at distance r from its axis is given as where is constant. Which of the following relations correctly represents current enclosed in the loop of radius r shown in figure:
EASY
A coil of 100 turns, 5cm2 area is placed in external magnetic field of 0.2 Tesla (S.I.) in such a way that it makes an angle 30° with the field direction. Calculate magnetic flux through the coil (in weber).
EASY
Electric fields induced by changing magnetic fields are
MEDIUM
Space of magnetism around the magnet, where magnetic influences can be experienced by a magnetic material, is called _____.
HARD
A metal coil of area number of turns mass and resistance is lying in a horizontal plane. A uniform time varying magnetic field is set-up to pass vertically through the coil at time . The field is first increased from to at a constant rate in time and then decreased from to zero in the same time . If the cycle is repeated continuously, then the correct graph(s) representing the variation of current and power dissipated with time is/are
MEDIUM
Write down the conclusions from Oersted's experiment.
EASY
Three long wires, with identical currents, either directly into or directly out of the page, are placed at three corners of a square in four different arrangements as shown. The correct order of the magnitude of the net magnetic field at the centre of the square is
I 
II 
III 
IV 
EASY
State the unit of magnetic field in terms of the force experienced by a current carrying conductor placed in a magnetic field.
