The correct answer is: (D) Copper. Copper is a diamagnetic material, meaning it is weakly repelled by a magnetic field. Unlike ferromagnetic materials like iron, cobalt and steel, diamagnetic substances do not retain magnetism and exhibit only a very weak, ...
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The correct statement is: (D) Tangent at a point on every field line gives the direction of magnetic field at that point. Magnetic field lines are continuous closed loops and never intersect each other. They represent both the direction and ...
Horizontal component BH = B cosδ. Given: BH 0.2G, B = 0.4G So, cosδ = 0.2/0.4 = 0.5 δ = cos⁻¹ (0.5) = 60°. Answer: (C) 60°.
In ferromagnetic materials, as the magnetizing field increases, permeability initially increases, reaches a maximum and then decreases due to magnetic saturation. So, permeability does not keep increasing. Correct answer: (A) decreases.
Let voltmeter resistance be R. Since scale becomes 50 times larger, current reduces by 50 times. So, total resistance becomes 50R. Given: 50R = R + 980 ⇒ 49R = 980 ⇒ R = 20 Ω. Answer: (B) 20 Ω.