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Questions >> JEEMAIN and NEET >> Physics >> Class12 >> Magnetism and Matter

A negatively and uniformly charged disk is rotating in a clockwise direction as viewed from above. The direction of magnetic field at a point A is

answered Sep 20, 2019 by prasoonverma514551

1 answer

Suppose a magnet is suspended by a vertical string, attached to its middle point. Given that the horizontal component of earth's magnetic field is $25\;\mu T$ and the vertical component of of earth's magnetic field is $40\;\mu T$ , find the position in which the magnet can stay in equilibrium.

answered Mar 14, 2014 by balaji.thirumalai

1 answer

Relative permittivity and permeability of a material are $\in_r$ and $\mu_r$ , respectively. Which of the following values of these quantities are allowed for a diamagnetic material?

answered Feb 27, 2014 by thanvigandhi_1

1 answer

A rigid circular loop of radius $r$ lies in the $x-y$ plane on a flat table and a current $i$ flows through it. At this place, the earth’s magnetic field is $B_x\hat i + B_z \hat k$ . The value of $i$ so that one end of the loop lifts up from the table is

answered Feb 23, 2014 by thanvigandhi_1

1 answer

The dimensions of $\large\frac{B^2C^2R^2}{2\mu_0}$ where $B$ is magnetic field, $R$ is resistance and $C$ is capacitance are

answered Feb 23, 2014 by thanvigandhi_1

1 answer

A circular loop of radius $R$ , carrying a current $i$ lies in the $x-y$ plane with its centre at the origin. The total magnetic flux through the $x-y$ plane is

answered Feb 22, 2014 by thanvigandhi_1

1 answer

The force experienced by a pole of strength $100\: A-m$ at a distance of $0.2 \: m$ from a short magnet of length $10\: cm$ and pole strength $100\: A-m$ on its axial line will be

answered Feb 22, 2014 by thanvigandhi_1

1 answer

A bar magnet of magnetic moment $4 A-m^2$ is free to rotate about a vertical axis through its centre. The magnet is released from rest from east-west position. Kinetic energy of the magnet in the north- south position will be $(H = 25 \mu T)$

answered Feb 21, 2014 by thanvigandhi_1

1 answer

A paramagnetic substance is kept in a weak magnetic field and its absolute temperature $T$ is increased. As a result, its magnetisation

answered Feb 21, 2014 by thanvigandhi_1

1 answer

If a magnetic needle is kept in a non-uniform magnetic field, it experiences

answered Feb 19, 2014 by thanvigandhi_1

1 answer

Magnetic moment of an electron in the $n^{th}$ orbit of the hydrogen atom is

answered Feb 19, 2014 by thanvigandhi_1

1 answer

An electron is moving along positive $x$ -axis. A uniform electric field exists along negative $y$ -axis. What should be the direction of the magnetic field (constant) so that the force on the electron is zero?

answered Feb 19, 2014 by thanvigandhi_1

1 answer

A copper wire of diameter $1.6mm$ carries a current i. The maximum magnetic field due to this wire is $5 \times 10^{-3} T$ . The value of $i$ is

answered Feb 19, 2014 by thanvigandhi_1

1 answer

A positively charged particle projected towards north is deflected towards west by a magnetic field. The field may be

answered Feb 17, 2014 by thanvigandhi_1

1 answer

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