Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

Two conducting circular loops F and G are kept in a plane on either side of a straight current-carrying wire as shown in the figure below.
If the current in the wire decreases in magnitude, the induced current in the loops will be:

When an impurity is doped into an intrinsic semiconductor, the conductivity of the semiconductor:

Pick the correct options:

Figure (i) shows a conducting loop being pulled out of a magnetic field with a speed v. Which of the four plots shown in figure (ii) may represent the power delivered by the pulling agent as a function of the speed v

(a) a

(b) b

(c) c

(d) d

A logic gate is an electronic circuit which

(a) Makes logic decisions

(b) Allows electrons flow only in one direction

(c) Works binary algebra

(d) Alternates between 0 and 1 values

When phosphorus and antimony are mixed in zermaniun, then

(a) P-type semiconductor is formed	(b) N-type semiconductor is formed
(c) Both (a) and (b)	(d) None of these

Intensity of an electric field E due to a dipole, depends on distance r as

(a) E ∝

(b) E ∝

(c) E ∝

(d) E ∝

An electric dipole is placed along the x - axis at the origin  O. A point P is at a distance of 20 cm from this origin such that OP makes an angle   with the x-axis. If the electric field at  P makes an angle θ with the x-axis, the value of θ  would be

(a)

(b)

(c)

(d)

Fusion reactions take place at about:

An electromagnetic radiation has an energy of 13.2 keV. Then the radiation belongs to the region of.