The magnetic potential energy when a magnetic bar with a magnetic moment M is placed perpendicular to the magnetic field B is:
1. mB2 2. zero
3. mB 4. mB
Subtopic:  Analogy between Electrostatics & Magnetostatics |
 75%
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A bob is whirled in a horizontal circle by means of a string at an initial speed of 10 rpm. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:
1. 20 rpm 2. 40 rpm
3. 5 rpm 4. 10 rpm
Subtopic:  Uniform Circular Motion |
 67%
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NEET - 2024
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A metal cube of a side 5 cm, is charged with 6 μC. The surface charge density on the cube, is:
1. 0.125×103 C m2 2. 0.25×103 C m2
3. 4×103 C m2 4. 0.4×103 C m2
Subtopic:  Electric Charge |
 53%
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NEET - 2024
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The incorrect relation for a diamagnetic material (all the symbols carry their usual meaning and ε is a small positive number) is:
1. μ<μ0
2. 0μr<1
3. 1χ<0
4. 1<μr<1+ε
Subtopic:  Magnetic Materials |
 60%
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An ideal fluid is flowing in a non-uniform cross-sectional tube XY (as shown in the figure) from end X to end Y. If K1 and K2 are the kinetic energies per unit volume of the fluid at X and Y respectively, the correct relationship between K1​ and K2​ is:
1. K1=K2 2. 2K1=K2
3. K1>K2 4. K1<K2
Subtopic:  Bernoulli's Theorem |
 70%
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The escape velocity for Earth is v. A planet having 9 times the mass of Earth and a radius, 16 times that of Earth, has the escape velocity of:
1. v3 2. 2v3
3. 3v4 4. 9v4
Subtopic:  Escape velocity |
 85%
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An electron and an alpha particle are accelerated by the same potential difference. Let λe and λα denote the de-Broglie wavelengths of the electron and the alpha particle, respectively, then:
1. λe>λα 2. λe=4λα
3. λe=λα 4. λe<λα
Subtopic:  De-broglie Wavelength |
 71%
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An object is moving along the horizontal x-direction with an initial kinetic energy of 10 J. It is displaced through x=(3i^) m under the influence of a force F=(2i^+3j^) N. The kinetic energy of the object at the end of the displacement x is:
1. 10 J 2. 16 J
3. 4 J 4. 6 J
Subtopic:  Work Energy Theorem |
 69%
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An object falls from a height of 10 m above the ground. After striking the ground it loses 50% of its kinetic energy. The height up to which the object can re-bounce from the ground is:
1. 7.5 m 2. 10 m
3. 2.5 m 4. 5 m
Subtopic:  Gravitational Potential Energy |
 67%
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In the circuit shown below, the inductance L is connected to a source. The current flowing in the circuit is I=I0sinωt. The voltage drop (VL) across L is:
1. ωL I0sinωt 2. I0ωLsinωt
3. I0ωLcosωt 4. ωL I0cosωt
Subtopic:  Different Types of AC Circuits |
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