Magnetism and Electromagnetism

A. pole strength
B. universal constant
C. scalar quantity
D. vector quantity

A. circular
B. triangular
C. rectangular
D. none of the above

A. change the direction of magnetic lines
B. amplify flux
C. restore lost flux
D. provide a closed path for flux

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

A. reluctance of conductor
B. resistance of conductor
C. A. and B. both in the same way
D. none of the above

A. the voltage across the two ends of exciting coil
B. the flow of an electric current
C. the sum of all currents embraced by one line of magnetic field
D. the passage of magnetic field through an exciting coil

A. Decreases
B. Increases
C. Remains same
D. First increases and then decreases depending on the depth of iron in¬sertion

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

A. the highest permeability of the iron rod
B. the lowest permeability of the iron rod
C. the permeability at the end of the iron rod
D. the permeability almost in non-magnetised state

A. decreases with increasing cross sectional area of material
B. increases with increasing cross-sec-tional area of material
C. does not vary with increasing cross-sectional area of material
D. any of the above