When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?

Related Mcqs:

1. The uniform magnetic field is______________?

   A. the field of a set of parallel conductors
   B. the field of a single conductor
   C. the field in which all lines of magnetic flux are parallel and equidistant
   D. none of the above

2. How does the magnetic compass needle behave in a magnetic field ?

   A. It assures a position right angle to magnetic field
   B. It starts rotating
   C. It assures a position which follows a line of magnetic flux
   D. None of the above

3. In a simple magnetic field the strength of magnet flux_______________?

   A. is constant and has same value in energy part of the magnetic field
   B. increases continuously from initial value to final value
   C. decreases continuously from initial value to final value
   D. first increases and then decreases till it becomes zero

4. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?

   A. 2 AT
   B. 4 AT
   C. 6 AT
   D. 10 AT

5. 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 ?

   A. 2500 AT/m
   B. 250 AT/m
   C. 25 AT/m
   D. 2.5 AT/m

6. Out of the following statements, concerning an electric field, which statement is not true ?

   A. The electric intensity is a vector quantity
   B. The electric field intensity at a point is numerically equal to the force exerted upon a charge placed at that point
   C. An electric field is defined as a point in space at which an electric charge would experience a force
   D. Unit field intensity in the exertion of a force of one newton on a charge of one coulomb

7. The magnetism left in the iron after exciting field has been removed is known as____________?

   A. permeance
   B. residual magnetism
   C. susceptance
   D. reluctance

8. 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____________?

   A. 240 N
   B. 24 N
   C. 2.4 N
   D. 0.24 N

9. A material which is slightly repelled by a magnetic field is known as_____________?

   A. ferromagnetic material
   B. diamagnetic material
   C. paramagnetic material
   D. conducting material

10. A magnetic field exists around____________?

    A. iron
    B. copper
    C. aluminium
    D. moving charges