The angle between the rotation axis and the magnetic axis of the earth is about
5o
17o
80o
25o
The angle, a magnetic needle makes with the horizontal plane in the earth’s magnetic field is called
Magnetic angle
Dip angle
Slope angle
Down angle
In a uniform magnetic field, where the b-vector has the same magnitude and direction at all points, the lines of induction are
Equally spaced
Parallel
Straight
All of the above
For the charged particles moving with velocities much smaller than the velocity of light c, the magnetic interaction will be very much _______ than the electric interaction.
Smaller
Larger
Weaker
None of the above
The work done, by a magnetic force on a charged particle
Is unity
Is zero
Depends on the magnitude of magnetic force
Depends on the magnitude of charge on the particle
/
Pierre Simon Laplace
Ampere
Biot and Savart
All of the above
An arrangement of two identical circular coils mounted coaxially in series with their centers at a distance apart equal to the radius of each coil is used in
Helmholtz galvanometer
Deflection galvanometer
Series galvanometer
Tangent galvanometer
The line integral of the magnetic induction B around any closed path is equal to times the net current across the area bounded by this path. It is called
Ampere’s law
Laplace’s law
Gauss’s law
Faraday’s law
The electric lines of flux leave and terminate on charges while the magnetic lines of flux are_______ closed loops.
Continuous
Discontinuous
Temporary
None of the above
The moving coil galvanometer is most useful for the detection of very small current of the order of
10-2 ampere
10-1 ampere
10-20 ampere
10-8 ampere