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.
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/
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.
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.
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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