If you hold the conductor with right hand so that the stretched thumb points in the direction of the currenta then encircling fingers will give the direction of magnetic lines of force round the conductor. This is known as
Left hand cork screw rule
Right hand cork screw rule
Left hand rule
Right hand rule
Correct Answer :
D. Right hand rule
Related Questions
How many electrons are needed in the valence orbit to give a material's stability?
Magnetic intensity is a
Phasor quantity
Physical quantity
Scalar quantity
Vector quantity
One coulomb of charge consists of ________ electrons.
624× 10^16
62.4 × 10^16
6.24 × 10^16
0.624 × 10^16
The magnetic potential in a magnetic circuit can be measured in terms of
Mmf
Emf
Farad
Coulomb
Electric lines of force leave or enter the charge surface at an angle of
30o
45 o
90o
depending upon the angle of launch and entry
A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?
30 ohms
20 ohms
15 ohms
7 ohms
The diameter of a hydrogen atom is approximately ______ cm.
1.1 x 10^-6
1.1 x 10^7
1.1 x 10^-8
1.1 x 10^-9
Which of the following is a paramagnetic material?
Carbon
Copper
Bismuth
Oxygen
The physical motion resulting from the forces of magnetic fields is called
Motor action
Rotation
Repulsion
Torque action
The quantity 10^6 maxwells is equivalent to one
Weber
Gauss
Gilbert
Tesla
The magnetic field of a bar magnet most closely resembles the magnetic field of
a horseshoe magnet
a straight current- carrying wire
a stream of electrons moving parallel to one another
a current- carrying wire loop
All magnetic field originates from
moving electric charge
Iron atoms
Magnetic domain
Permanent magnets
The unit of flux density is
Wb/m
Tesla
At/m
N/Wb
Ohm's law cannot be applied to which material?
Copper
Silver
Silicon carbide
Aluminum
The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
Magnetic effect
Magnetic phenomenon
Magnetic induction
Electromagnetic induction
The temperature coefficient of resistance of a conductor ______ with an increase in temperature.
increases
decreases
remains the same
becomes negative
What is the unit of magnetomotive force?
Volt
Tesla
Ampere- turn
Weber
Who developed the electromagnetic theory of light in 1862?
Heinrich Rudolf Hertz
Wilhelm Rontgen
James Clerk Maxwell
Andre Ampere
Electric field intensity at a point is numerically equal to ________ at that point.
potential gradient
potential difference
dielectric constant
the force
The force between two magnetic poles varies with the distance between them. The variation is ______ to the square of that distance.
Equal
Greater than
Directly proportional
Inversely proportional
Steel is hard to magnetize because of its
Low permeability
High permeability
High density
High retentivity
The customary energy unit in atomic and nuclear physics is
Joule
Volt- coulomb
electron-volt
Walt- second
What is the SI unit of magnetic flux?
Tesla
Weber
Maxwell
Gauss
An alloy of 40 percent iron and 60 percent nickel.
Alnico
Permalloy
Hipernik
Manganin
What is the cgs unit of magnetomotive force?
Gilbert
Ampere- turn
Maxwell
Weber
A good conductor has how many valence electrons?
Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions
Ionic bond
Covalent Bond
Electrostatic Bond
Metallic bond
Mmf in a magnetic circuit corresponds to _____ in an electric circuit
Emf
Voltage drop
Electric Field Intensity
Potential gradient
The B-H curve for ________ is a straight line passing through the origin.
cobalt
air
hardened steel
soft iron
When the relative permeability of a material is slightly more than 1a it is called ______ material.
diamagnetic
ferromagnetic
paramagnetic
non-magnetic