Magnetism & Electromagnetism Multiple Choice Questions - Set 02 - ObjectiveBooks

Magnetism & Electromagnetism Multiple Choice Questions - Set 02

Practice Test: Question Set - 02

1. The direction of a magnetic field within a magnet is
    (A) From south to north
    (B) From north to south
    (C) Back to front
    (D) Front to back

2. 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

3. Electromagnetic induction is the force that produces a magnetic field.
    (A) True
    (B) False

4. A square cross-sectional magnet has a pole strength of 1 × 10 Wb and cross sectional area of 20 mm × 20 mm. What is the strength at a distance of 100 mm from the unit pole in air?
    (A) 63.38 N/Wb
    (B) 633.8 N/Wb
    (C) 6338 N/Wb
    (D) 63380 N/Wb

5. The commonly used material for shielding or screening magnetism is
    (A) Copper
    (B) Aluminium
    (C) Soft iron
    (D) Brass

6. The unit for reluctance is
    (A) Tesla
    (B) At/Wb
    (C) At/m
    (D) Wb

7. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.
    (A) Circular
    (B) Triangular
    (C) Rectangular
    (D) None of the above

8. An electromagnetic field exists only when there is
    (A) An increasing current
    (B) Decreasing current
    (C) Voltage
    (D) Current

9. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?
    (A) 2
    (B) 4
    (C) 6
    (D) 8

10. The susceptibility of paramagnetic materials generally lies between
    (A) KT3 and 1CT6
    (B) 1CT3 and 1CT7
    (C) KT4 and KT8
    (D) 10"2 and KT5

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