Question: The uniform magnetic field is______________?

• 1. the field of a set of parallel conductors
• 2. the field of a single conductor
• 3. the field in which all lines of magnetic flux are parallel and equidistant
• 4. none of the above

Question: The change of cross-sectional area of conductor in magnetic field will affect______________?

• 1. reluctance of conductor
• 2. resistance of conductor
• 3. A and B both in the same way
• 4. none of the above

Question: The magneto-motive force is______________?

• 1. the voltage across the two ends of exciting coil
• 2. the flow of an electric current
• 3. the sum of all currents embraced by one line of magnetic field
• 4. the passage of magnetic field through an exciting coil

Question: 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 ?

• 1. Decreases
• 2. Increases
• 3. Remains same
• 4. First increases and then decreases depending on the depth of iron in¬sertion

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

• 1. 2 AT
• 2. 4 AT
• 3. 6 AT
• 4. 10 AT

Question: The initial permeability of an iron rod is________________?

• 1. the highest permeability of the iron rod
• 2. the lowest permeability of the iron rod
• 3. the permeability at the end of the iron rod
• 4. the permeability almost in non-magnetised state

Question: Which of the following statements is correct ?

• 1. The magnetic flux inside an exciting coil is lower than its outside surface
• 2. The magnetic flux inside an exciting coil is zero
• 3. The magnetic flux inside the exciting coil is greater than its outside surface
• 4. The magnetic flux inside the exciting coil is same as on its outside surface

Question: The magnetic reluctance of a material______________?

• 1. decreases with increasing cross sectional area of material
• 2. increases with increasing cross-sec-tional area of material
• 3. does not vary with increasing cross-sectional area of material
• 4. any of the above

Question: In a simple magnetic field the strength of magnet flux_______________?

• 1. is constant and has same value in energy part of the magnetic field
• 2. increases continuously from initial value to final value
• 3. decreases continuously from initial value to final value
• 4. first increases and then decreases till it becomes zero

Question: The bar magnet has____________?

• 1. the dipole moment
• 2. monopole moment
• 3. A and B both
• 4. none of the above