Magnetism — Physics STD 12 Science — Question

What is the modulation index of an over modulated wave(a) 1 (b) Zero(c) < 1(d) > 1

Which of the following statements can help you to determine the direction of induced current in Electromagnetic Induction?

Which of the following best describe the electromagnetic induction?

A polariser is used to(a) Reduce intensity of light(b) Produce polarised light(c) Increase intensity of light(d) Produce unpolarised light

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

In electrolytic capacitors positive terminal is

An object is placed 40 cm  from a concave mirror of focal length 20 cm  The image formed is(a) Real, inverted and same in size(b) Real, inverted and smaller(c) Virtual, erect and larger(d) Virtual, erect and smaller

For small currents, ‘X’ obeys Ohm’s law. But when large currents are passed through the same conductor, it deviates from ohmic behaviour. Identify X.

If in a logic gate output (Y) is obtained by the product of its both inputs (A, B) then the gate is :

If the electric force between two unknown charges is attractive, identify which of the following statement must be true?