Atoms — Physics STD 12 Science — Question

A point P is situated on the axis of an electric dipole at a distance x from its mid-point, the electric potential at point P is proportional to:

If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be

(a) 3.2 × 10–10 J

(b) 3.2 ×  10–18 J

(c) 1 N

(d) 1 dyne

Two point charges (+Q)  and (-2Q) are fixed on the X-axis at positions a and 2a  from origin respectively. At what positions on the axis, the resultant electric field is zero

(a) Only x =

(b) Only x = -

(c) Both x = ±

(d) x =  only

In the circuit as shown in the figure the effective capacitance between A and B is

(a) 3 μF

(b) 2 μF

(c) 4 μF

(d) 8 μF

Two coils of self inductances 2 mH and 8 mH are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

Let p and E denote the linear momentum and the energy of a photon. For another photon of smaller wavelength (in same medium):

Statement-1: NOT gate is also called invertor circuit.

Statement-2: NOT gate inverts the input order.

Twelve wires of equal length and same cross-section are connected in the form of a cube. If the resistance of each of the wires is  R, then the effective resistance between the two diagonal ends would be

(a) 2 R

(b) 12 R

(c)

(d) 8 R

A curve between magnetic moment and temperature of magnet is

(a)

(b)

(c)

(d)