Related Questions
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If a 20 V potential is applied across a relay coil with 50 turns having 1 ? of resistancea the total magnetomotive producing magnetic flux in the circuit is
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The resistance of a material is ____________ its area of cross-section.
C. inversely proportional to
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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as
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If the number of valence electrons of an atom is less than 4a the substance is called
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A magnetic field is
A. The current flow through space around a permanent magnet
B. The force set up when current flows through a conductor
C. The force that drives current through a resistor
D. The force between the plates of a charged capacitor
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The magnetic field around the conductor is determined by the
C. Current divided by the resistance
D. Resistance divided by the current
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Who developed the electromagnetic theory of light in 1862?
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One farad equals
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When a current carrying conductor is placed in a magnetic fielda the maximum force will act on the conductor when the conductor is at an angle of _______ to the magnetic field.
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Which of the following materials has the highest dielectric strength?
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One weber of flux is equal to _______ magnetic lines of force.
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The core of a magnetic equipment uses a magnetic material with
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The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet
D. Electromagnetic induction
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Which of the following materials has the least hysteresis loop area?
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Germanium atom has ______ protons and ______ electrons.
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The force acting on a unit n- pole placed at that point is called
A. Magnetic field intensity
B. Electric field intensity
C. Electromagnetic field intensity
D. Intensity magnetization
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When the current flowsa the magnetic field ��. conductor is in what direction?
A. The same as the current direction
B. Opposite the current direction
D. In the direction determined by the left hand rule
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A germanium atom has an atomic weight of72. How many neutrons are there?
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Refers to the magnetic lines
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What determines the atomic number of an element?
B. The number of electrons
C. The number of neutrons
D. The number of neutrons and protons
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Which of the following is a natural magnet?
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The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the platesa then electric field intensity will be
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The force which set ups or tends to set up magnetic flux in a magnetic circuit
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The electric flux density is a ________ quantity.
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What determines the value of the temperature coefficient of resistance of a material?
D. nature and temperature
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When the relative permeability of a material is slightly more than 1a it is called ______ material.
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Permeability means
A. The conductivity of the material for magnetic lines of force
B. The magnetization test in the material after exciting field has been removed
C. The strength of an electromagnet
D. The strength of the permanent magnet
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The conduction of electricity across the surface of a dielectric is called
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The point in a magnet where the intensity of magnetic lines of force is maximum
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Temporary magnets are commonly employed in
C. moving coils loudspeakers