1. The relation between μ and H for a specimen of iron is as follows- μ = [0.4/H + 12 × 10–4] Henry / meter The value of H which produces flux density of 1 Tesla will be- (A) 250 A/m (B) 500 A/m (C) 750 A/m (D) 103 A/m Solution:(B) B = μH or B = [0.4 / H + 12 × 10–4] H or 1 = 0.4 + 12×10–4 H H = 500 A/m 2. The SI unit of magnetic flux is- (A) Weber (B) Maxwel (C) Tesla (D) Gauss Solution: (A) Φ = BA = Weber m2/m2 = Weber 4. The intensity of magnetic field due to an isolated pole of strength mp at a point distant r from it will be- (A) mp / r2 (B) mpr2 (C) r2 / mp (D) mp / r Solution: (A) The magnetic intensity due to an isolated pole of strength mp at a distance r = mp / r2 5. A uniform magnetic field is directed from left towards right in the plane of paper. When a piece of soft iron is placed parallel to the field. The magnetic lines of force passing through it will be- Solution: (C) The magnetic lines of force in a ferrmagnetic material are crowded together.
Posted on: Wed, 16 Oct 2013 10:01:10 +0000
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