When a charged particle with velocity v is subjected to an induction magnetic field B, the force on it is non-zero. What does this imply?

1. angle between v and B is necessarily 90o.
2. angle between v and B can have any value other than 90o.
3. angle between v and B can have any value other than zero and 180o.
4. angle between v and B is either zero or 180o.

Subtopic:  Lorentz Force |
 67%
From NCERT
AIPMT - 2006
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NEET 2023 - Target Batch - Aryan Raj Singh
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Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of the potential difference applied across them so that the magnetic field at their centres is the same?
1. 3
2. 4
3. 6
4. 2

Subtopic:  Magnetic Field due to various cases |
 59%
From NCERT
AIPMT - 2006
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A cylindrical conductor of radius \(R\) is carrying a constant current. The plot of the magnitude of the magnetic field \(B\) with the distance \(d\) from the centre of the conductor is correctly represented by the figure:

1. 2.
3. 4.
Subtopic:  Ampere Circuital Law |
 69%
From NCERT
NEET - 2019
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Ionized hydrogen atoms and \(\alpha\text-\)particles with the same momenta enter perpendicular to a constant magnetic field, \(B\). The ratio of their path radii \(r_\text{H}:r_\alpha\) will be:

1. \(1:4\) 2. \(2:1\)
3. \(1:2\) 4. \(4:1\)
Subtopic:  Lorentz Force |
 64%
From NCERT
NEET - 2019
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Adjoining figure shows a rectangular loop of conductor carrying a current i. The length and breadth of the loop are respectively a and b. The magnetic field at the centre of loop is:-

1. μ0i(a+b)2πa2+b2

2. μ0iab2πa2+b2

3. μ0i(a+b)πa2+b2

4. 2μ0ia2+b2πab

Subtopic:  Biot-Savart Law |
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A beam of electrons passes un-deflected through mutually perpendicular electric and magnetic fields. Where do the electrons move if the electric field is switched off and the same magnetic field is maintained?

1. in an elliptical orbit.
2. in a circular orbit.
3. along a parabolic path.
4. along a straight line.

Subtopic:  Lorentz Force |
 70%
From NCERT
AIPMT - 2007
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In a mass spectrometer used for measuring the masses of ions, the ions are initially accelerated by an electric potential V and then made to describe semi-circular paths of radius R using a magnetic field B. If V and B are kept constant, the ratio of \(\big(\frac{\text{Charge on the ion}}{\text{Mass of the ion}} \big)\) will be proportional to:

1. 1R

2. 1R2

3. R2

4. R

Subtopic:  Lorentz Force |
 56%
From NCERT
AIPMT - 2007
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If a charged particle (charge q) is moving in a circle of radius R at a uniform speed v, then the value of its associated magnetic moment μ will be:

1. qvR2

2. qvR2

3. qvR22

4. qvR

Subtopic:  Magnetic Moment |
 75%
From NCERT
AIPMT - 2007
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The resistance of an ammeter is 13 Ω and its scale is graduated for a current up to 100 A. After an additional shunt has been connected to this ammeter, it becomes possible to measure currents up to 750 A by this ammeter. The value of shunt resistance is:

1. 20 Ω

2. 2 Ω

3. 0.2 Ω

4. 2 kΩ

Subtopic:  Moving Coil Galvanometer |
 78%
From NCERT
AIPMT - 2007
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An electron moving in a circular orbit of radius \(r\) makes \(n\) rotations per second. The magnetic field produced at the centre has a magnitude:
1. \(\frac{\mu_0ne}{2\pi r}\)
2. zero
3. \(\frac{n^2e}{r}\)
4. \(\frac{\mu_0ne}{2r}\)

Subtopic:  Magnetic Field due to various cases |
 66%
From NCERT
NEET - 2015
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