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If a diamagnetic material is placed in a magnetic field, the magnetic field inside the material compared to that outside will be
When a diamagnetic material is placed in a magnetic field, it develops an induced magnetic moment opposite to the applied field. This opposes the external field and slightly reduces the net magnetic field inside the material compared to outside. Hence, the internal field is slightly less than the exRead more
When a diamagnetic material is placed in a magnetic field, it develops an induced magnetic moment opposite to the applied field. This opposes the external field and slightly reduces the net magnetic field inside the material compared to outside. Hence, the internal field is slightly less than the external one.
Answer: (A) Slightly less.
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Which of the following statements is correct ?
The correct statement is: A tangent at a point on every magnetic field line gives the direction of the magnetic field at that point. This is a fundamental property of field lines. The other statements are incorrect: magnetic field lines do form closed loops, they don’t begin or end, and they never iRead more
The correct statement is: A tangent at a point on every magnetic field line gives the direction of the magnetic field at that point. This is a fundamental property of field lines. The other statements are incorrect: magnetic field lines do form closed loops, they don’t begin or end, and they never intersect.
Answer: (D) Tangent at a point on every field line gives the direction of magnetic field at that point.
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The horizontal component of earth’s magnetic field at a place is 0.2 G, whereas its total magnetic field is 0.4 G. The angle of dip at the place is
The angle of dip θ is given by: cos θ = B H/ B Where B H =0.2G (horizontal component) and B = 0.4G (total field). cosθ = 0.2/0.4 = 0.5 ⇒ θ = cos⁻¹ (0.5) = 60° Answer: (C) 60°. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-5/
The angle of dip
θ is given by:
cos
θ =
B
H/
B
Where
B
H
=0.2G (horizontal component) and
B = 0.4G (total field).
cosθ = 0.2/0.4 = 0.5 ⇒ θ = cos⁻¹
(0.5) = 60°
Answer: (C) 60°.
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If the magnetizing field on a ferromagnetic material is increased, its permeability
In a ferromagnetic material, as the magnetizing field increases, the permeability (μ) initially increases due to alignment of magnetic domains. However, after a certain point (near saturation), further increase in the magnetizing field causes the permeability to decrease, as most domains are alreadyRead more
In a ferromagnetic material, as the magnetizing field increases, the permeability (μ) initially increases due to alignment of magnetic domains. However, after a certain point (near saturation), further increase in the magnetizing field causes the permeability to decrease, as most domains are already aligned.
Answer: (A) decreases.
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A resistance of 980 Ω is connected in series with a voltmeter, after which the scale division becomes 50 times larger. The resistance of voltmeter is
Let the resistance of the voltmeter be Rv . When a 980 Ω resistor is connected in series, the total resistance becomes Rv + 980 and the sensitivity (scale division) becomes 50 times larger, meaning the current is reduced to 1/50 of original. Using the current division rule: Rv/Rv + 980 = 1/50 ⇒ 50RRead more
Let the resistance of the voltmeter be Rv . When a 980 Ω resistor is connected in series, the total resistance becomes
Rv + 980 and the sensitivity (scale division) becomes 50 times larger, meaning the current is reduced to
1/50 of original.
Using the current division rule:
Rv/Rv + 980 = 1/50 ⇒ 50R
v = R
v +980 ⇒ 49R
v = 980 ⇒ R
v = 20Ω
Answer: (B) 20Ω.
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