Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Why potentiometer is more effective instrument in measuring electromotive force of cell than voltmeter?

Sketch the magnetic field lines for a current-carrying circular loop near its centre. Replace the loop by an equivalent magnetic dipole and sketch the magnetic field lines near the centre of the dipole. Identify the difference.

The contact angle between water and glass is 0^º. When water is poured in a glass to the maximum of its capacity, the water surface is convex upward. The angle of contact in such a situation is more than 90^º. Explain.

The peak power consumed by a resistive coil, when connected to an AC source, is 80W. Find the energy consumed by the coil in 100 seconds, which is many times larger than the time period of the source.

Why is a white dress more comfortable than a dark dress in summer?

Explain in brief about emission spectrum and absorption spectrum.

A particle of mass 0.3kg is subjected to a force F = -kx with k = 15N/m. What will be its initial acceleration if it is released from a point x = 20cm?

Can the entire charge of a charged object 'A' be transferred to another object 'B'? If yes then how would it be possible, if not then why?

Obtain the de Broglie wavelength of a neutron of kinetic energy 150 eV. As you have seen in Exercise 11.31, an electron beam of this energy is suitable for crystal diffraction experiments. Would a neutron beam of the same energy be equally suitable? Explain. (m_n = 1.675 × 10^–27 kg).