A. meter is surrounded by strong magnetic fields
B. a soft iron shielding is used
C. a plastic shielding is provided
D. a shielding of anon-magnetic material is used
Correct Answer: a soft iron shielding is used ✔
Last Updated: December 17, 2018
Related MCQs
- The relative permeability is less than unity is case of__________?
- Which of the following is not a unit of flux?
- One telsa is equal to__________?
- The magnetism left in the iron after exciting field has been removed is known as__________?
- Which of the following is expected to have the maximum permeability ?
- One maxwell is equal to__________?
- Out of the following statements, concerning an electric field, which statement is not true ?
- Susceptibility is positive for__________?
- When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon__________?
- When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?
- A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be__________?
- The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?
- Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be__________?
- A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be__________?
- A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
- Unit for quantity of electricity is__________?
- What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
- The unit of flux is the same as that of__________?
- The commonly used material for shielding or screening magnetism is__________?
- The Biot-savart’s law is a general modification of__________?
- If a copper disc is rotated rapidly below a freely suspended magnetic needle, the magnetic needle shall start rotating with a velocity?
- What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200 ?
- The materials are a bit inferior conductors of magnetic flux than air
- he retentivity (a property) of material is useful for the construction of__________?
- he retentivity (a property) of material is useful for the construction of__________?
- A permanent magnet__________?
- The relative permeability of materials is not constant
- A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be__________?
- Magnetic moment is a__________?
- Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials
- A keeper is used to__________?
- The uniform magnetic field is__________?
- The change of cross-sectional area of conductor in magnetic field will affect__________?
- The magneto-motive force is__________?
- A certain amount of current flows through a ring-shaped coil with fixed number of turns. How does the magnetic induction B varies inside the coil if an iron core is threaded into coil without dimensional change of coil ?
- What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
- The initial permeability of an iron rod is__________?
- Which of the following statements is correct ?
- The magnetic reluctance of a material__________?
- In a simple magnetic field the strength of magnet flux__________?
- The bar magnet has__________?
- How does the magnetic compass needle behave in a magnetic field ?
- Which of the following type of materials are not very important for engineering applications ?
- The stray line of magnetic flux is defined as__________?
- Which of the following materials are diamagnetic ?
- For which of the following materials the saturation value is the highest ?
- The attraction capacity of electromagnet will increase if the__________?
- The susceptibility of paramagnetic materials generally lies between__________?
- Temporary magnets are used in__________?
- For which of the following materials the net magnetic moment should be zero ?
- Which of the following statements is correct ?