Q. What is the length of the latus rectum of the ellipse x^2/36 + y^2/16 = 1?
A.
8/3
B.
12
C.
16/3
D.
24
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Solution
The length of the latus rectum is given by (2b^2/a). Here, b^2 = 16, a^2 = 36, so length = (2*16/6) = 12.
Correct Answer: B — 12
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Q. What is the length of the latus rectum of the ellipse x^2/a^2 + y^2/b^2 = 1?
A.
2b^2/a
B.
2a^2/b
C.
2a
D.
2b
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Solution
The length of the latus rectum of the ellipse is given by 2a^2/b.
Correct Answer: B — 2a^2/b
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Q. What is the length of the latus rectum of the parabola y^2 = 12x?
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Solution
The length of the latus rectum of a parabola given by the equation y^2 = 4px is 4p. Here, 4p = 12, so p = 3. Therefore, the length of the latus rectum is 4p = 12.
Correct Answer: B — 6
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Q. What is the length of the latus rectum of the parabola y^2 = 4ax?
A.
2a
B.
4a
C.
a
D.
None of the above
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Solution
The length of the latus rectum of the parabola y^2 = 4ax is 4a.
Correct Answer: A — 2a
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Q. What is the length of the latus rectum of the parabola y^2 = 8x?
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Solution
The length of the latus rectum of the parabola y^2 = 8x is 4.
Correct Answer: A — 4
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Q. What is the length of the line segment joining the points (-1, -1) and (2, 3)?
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Solution
Length = √[(2 - (-1))² + (3 - (-1))²] = √[3² + 4²] = √25 = 5.
Correct Answer: C — 5
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Q. What is the length of the line segment joining the points (1, 2) and (1, 5)?
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Solution
Length = |5 - 2| = 3.
Correct Answer: A — 3
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Q. What is the length of the median from vertex A to side BC in triangle ABC with sides a = 6, b = 8, c = 10?
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Solution
Median length m_a = 1/2 * √(2b^2 + 2c^2 - a^2) = 1/2 * √(2*8^2 + 2*10^2 - 6^2) = 1/2 * √(128 + 200 - 36) = 1/2 * √292 = 7.
Correct Answer: C — 7
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Q. What is the length of the segment of the line 3x + 4y = 12 between the x-axis and y-axis?
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Solution
The x-intercept is (4, 0) and the y-intercept is (0, 3). The length of the segment is sqrt((4-0)^2 + (0-3)^2) = sqrt(16 + 9) = 5.
Correct Answer: B — 6
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Q. What is the limit of (1/x) as x approaches infinity?
A.
0
B.
1
C.
Infinity
D.
-Infinity
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Solution
As x approaches infinity, (1/x) approaches 0.
Correct Answer: A — 0
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Q. What is the limit of (x^2 - 1)/(x - 1) as x approaches 1?
A.
0
B.
1
C.
2
D.
Infinity
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Solution
Using L'Hôpital's Rule, lim (x -> 1) (x^2 - 1)/(x - 1) = lim (x -> 1) (2x)/(1) = 2.
Correct Answer: C — 2
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Q. What is the limit of f(x) = 1/x as x approaches 0 from the right?
A.
0
B.
Infinity
C.
1
D.
Does not exist
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Solution
As x approaches 0 from the right, f(x) approaches infinity, indicating a discontinuity at x = 0.
Correct Answer: B — Infinity
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Q. What is the limiting reagent when 3 moles of A react with 2 moles of B to produce 4 moles of C?
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Solution
The reaction requires 1.5 moles of B for 3 moles of A. Since only 2 moles of B are available, B is the limiting reagent.
Correct Answer: B — B
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Q. What is the limiting reagent when 5 moles of A react with 3 moles of B in the reaction A + 2B → C?
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Solution
The reaction requires 2 moles of B for every mole of A. For 5 moles of A, 10 moles of B are needed. Since only 3 moles of B are available, B is the limiting reagent.
Correct Answer: B — B
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Q. What is the magnetic field at a distance r from an infinitely long straight wire carrying current I?
A.
μ₀I/2πr
B.
μ₀I/4πr
C.
μ₀I/πr
D.
0
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Solution
Using Ampere's Law, B = μ₀I/2πr for an infinitely long straight wire.
Correct Answer: A — μ₀I/2πr
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Q. What is the magnetic field at a point due to a long straight current-carrying conductor using Biot-Savart Law?
A.
μ₀I/(2πr)
B.
μ₀I/(4πr²)
C.
μ₀I/(2r)
D.
μ₀I/(4r)
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Solution
The magnetic field B at a distance r from a long straight conductor carrying current I is given by B = μ₀I/(2πr) according to Biot-Savart Law.
Correct Answer: A — μ₀I/(2πr)
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Q. What is the magnetic field at a point on the axis of a circular loop of radius R carrying a current I at a distance x from the center?
A.
(μ₀I)/(2R) * (R²/(R²+x²)^(3/2))
B.
(μ₀I)/(4R) * (R²/(R²+x²)^(3/2))
C.
(μ₀I)/(2R) * (1/(R²+x²)^(3/2))
D.
(μ₀I)/(4R) * (1/(R²+x²)^(3/2))
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Solution
The magnetic field on the axis of a circular loop is given by B = (μ₀I)/(2R) * (R²/(R²+x²)^(3/2)).
Correct Answer: A — (μ₀I)/(2R) * (R²/(R²+x²)^(3/2))
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Q. What is the magnetic field at a point on the axis of a circular loop of radius R carrying current I?
A.
μ₀I/(2R)
B.
μ₀I/(4R)
C.
μ₀I/(2R²)
D.
μ₀I/(2√2R)
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Solution
The magnetic field on the axis of a circular loop is given by B = (μ₀I/(2R)) * (1/(1 + (z/R)²)^(3/2)) where z is the distance along the axis.
Correct Answer: D — μ₀I/(2√2R)
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Q. What is the magnetic field at the center of a circular loop of radius R carrying a current I?
A.
μ₀I/(2R)
B.
μ₀I/(4R)
C.
μ₀I/(R)
D.
μ₀I/(8R)
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Solution
The magnetic field at the center of a circular loop is given by B = μ₀I/(2R).
Correct Answer: A — μ₀I/(2R)
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Q. What is the magnetic field at the center of a circular loop of radius R carrying current I?
A.
μ₀I/2R
B.
μ₀I/R
C.
μ₀I/4R
D.
μ₀I/πR
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Solution
The magnetic field at the center of a circular loop is given by B = μ₀I/2R.
Correct Answer: A — μ₀I/2R
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Q. What is the magnetic field at the center of a square loop of side a carrying current I?
A.
μ₀I/4a
B.
μ₀I/2a
C.
μ₀I/a
D.
μ₀I/8a
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Solution
The magnetic field at the center of a square loop is B = μ₀I/4a.
Correct Answer: A — μ₀I/4a
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Q. What is the magnetic field at the midpoint of a wire carrying current I in opposite directions?
A.
Zero
B.
μ₀I/2
C.
μ₀I
D.
Depends on distance
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Solution
At the midpoint, the magnetic fields due to the two currents cancel each other out, resulting in zero net magnetic field.
Correct Answer: A — Zero
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Q. What is the magnetic field due to a circular loop of radius R carrying current I at a point on its axis at a distance x from the center?
A.
μ₀I/(2R)
B.
μ₀I/(2(x² + R²)^(3/2))
C.
μ₀I/(4πR)
D.
μ₀I/(x² + R²)
Show solution
Solution
The magnetic field at a point on the axis of a circular loop at a distance x from the center is given by B = μ₀I/(2(x² + R²)^(3/2)).
Correct Answer: B — μ₀I/(2(x² + R²)^(3/2))
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Q. What is the magnetic field due to a current I flowing through a straight wire at a distance d?
A.
μ₀I/(2πd)
B.
μ₀I/(4πd²)
C.
μ₀I/(d)
D.
μ₀I/(2d)
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Solution
The magnetic field B at a distance d from a straight wire carrying current I is given by B = μ₀I/(2πd).
Correct Answer: A — μ₀I/(2πd)
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Q. What is the magnetic field due to a current loop at a point on its axis?
A.
μ₀I/2R
B.
μ₀I/4R
C.
μ₀I/2R²
D.
μ₀I/4R²
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Solution
Using Ampere's Law, B = μ₀I/2R² at a point on the axis of a current loop.
Correct Answer: C — μ₀I/2R²
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Q. What is the magnetic field due to a long straight wire carrying current I at a distance r from the wire?
A.
μ₀I/2πr
B.
μ₀I/4πr
C.
μ₀I/πr
D.
μ₀I/8πr
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Solution
The magnetic field due to a long straight wire is given by B = (μ₀I)/(2πr).
Correct Answer: A — μ₀I/2πr
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Q. What is the magnetic field due to a magnetic dipole at a point along its axial line?
A.
(μ₀/4π) * (2m/r³)
B.
(μ₀/4π) * (m/r³)
C.
(μ₀/4π) * (m/r²)
D.
(μ₀/4π) * (m/r⁴)
Show solution
Solution
The magnetic field due to a magnetic dipole at a point along its axial line is given by B = (μ₀/4π) * (2m/r³).
Correct Answer: A — (μ₀/4π) * (2m/r³)
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Q. What is the magnetic field due to a solenoid of length L, carrying n turns per unit length and current I?
A.
μ₀nI
B.
μ₀nI/L
C.
μ₀nI/2
D.
μ₀nI/L²
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Solution
The magnetic field inside a long solenoid is B = μ₀nI.
Correct Answer: A — μ₀nI
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Q. What is the magnetic field due to a straight conductor at a point 1 meter away carrying a current of 5 A?
A.
0.01 T
B.
0.02 T
C.
0.03 T
D.
0.04 T
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Solution
Using Biot-Savart Law, B = μ₀I/(2πr) = (4π × 10^-7 Tm/A)(5 A)/(2π(1 m)) = 0.01 T.
Correct Answer: B — 0.02 T
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Q. What is the magnetic field due to a straight wire at a distance of 0.5 m carrying a current of 10 A?
A.
0.4 μT
B.
0.2 μT
C.
0.1 μT
D.
0.8 μT
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Solution
Using B = μ₀I/(2πr), substituting μ₀ = 4π × 10⁻⁷ Tm/A, I = 10 A, and r = 0.5 m gives B = 0.4 μT.
Correct Answer: A — 0.4 μT
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