Electric Charges and Fields — Physics STD 12 Science — Question

A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r  from its centre

(a) Increases as r increases for r < R	(b) Decreases as r  increases for 0 < r < ∞
(c) Decreases as r  increases for R < r < ∞	(d) a, c

There is a uniform electric field of strength   along y-axis. A body of mass 1g and charge is projected into the field from origin along the positive x-axis with a velocity 10m/s. Its speed in m/s after 10s is (Neglect gravitation)

(a) 10

(b) 5

(c) 10

(d) 20

For the propagation of light wave, medium is required. This is according to:

Anti-nodal curves represent the points joining:

Spectrum of sunlight is an example for:

Speed of electromagnetic waves in vacuum is:

Check the incorrect statement: When a magnet is moved into a coil the strength of the current depends on:

The slits in a Young's double slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is I₀. If one of the slits is closed, the intensity at this point will be:

The continuous X-rays spectrum produced by an X-ray machine at constant voltage has

(a) A maximum wavelength	(b) A minimum wavelength
(c) A single wavelength	(d) A minimum frequency

X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has

(a) Electric charge

(b) Magnetic moment

(c) Both electric charge and magnetic moment

(d) Neither electric charge nor magnetic moment