HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Physics

What happens to the domains in a ferromagnetic material in the presence of external magnetic field?

Compare the properties of soft and hard ferromagnetic materials.

The flux linked with a coil at any instant t is given by Φ_B = − 10t² - 50t + 250. The induced emf at t = 3 s is

The current i flowing in a coil varies with time as shown in the figure. The variation of induced emf with time would be

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

Mention the ways of producing induced emf.

How will you induce an emf by changing the area enclosed by the coil?

Show mathematically that the rotation of a coil in a magnetic field over one rotation induces an alternating emf of one cycle.

A rectangular coil of area 6 cm2 having 3500 turns is kept in a uniform magnetic field of 0.4 T. Initially, the plane of the coil is perpendicular to the field and is then rotated through an angle of 180°. If the resistance of the coil is 35 Ω, find the amount of charge flowing through the coil.

A fan of metal blades of length 0.4 m rotates normal to a magnetic field of 4 x 10^-3 T. If the induced emf between the centre and edge of the blade is 0.02 V, determine the rate of rotation of the blade.

A bicycle wheel with metal spokes of 1 m long rotates in Earth’s magnetic field. The plane of the wheel is perpendicular to the horizontal component of Earth’s field of 4 x 10^-5 T. If the emf induced across the spokes is 31.4 mV, calculate the rate of revolution of the wheel.

A graph between the magnitude of the magnetic flux linked with a closed-loop and time is given in the figure. Arrange the regions of the graph in ascending order of the magnitude of induced emf in the loop.

Atomic number of H-like atom with ionization potential 122.4 V for n = 1 is ______.

The nucleus is approximately spherical in shape. Then the surface area of nucleus having mass number A varies as ______.

The mass of a \[\ce{^7_3Li}\] nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of \[\ce{^7_3Li}\] nucleus is nearly ______.

M_p denotes the mass of the proton and M_n denotes mass of a neutron. A given nucleus of binding energy B, contains Z protons and N neutrons. The mass M (N, Z) of the nucleus is given by(where c is the speed of light)

A radioactive nucleus (initial mass number A and atomic number Z) emits 2α and 2 positrons. The ratio of a number of neutrons to that of protons in the final nucleus will be ______.

A radiative element has N₀ number of nuclei at t = 0. The number of nuclei remaining after half of a half-life (that is, at time t = `1/2 "T" _(1/2)`).

Define the ionization energy.

Define the ionization potential.