05:31

Q 10 Energy levels A, B and C of an atom correspond to increasing values of energy i.e EA less than

10:13

Figure (A) and ( B) shows two LR circuits .Growth of current in the circuit is as shown in Figure (C

02:31

Q 9 An n type semiconductor Si is obtained by dropping intrinsic Si with [ Set 3- 55/2/3 Cbse board

02:47

Q 8 The momentum ( In S.I unit ) associated with a photon of energy 1.5 eV is [ Set 3 55/2/3 CBSE ]

03:58

Q7 In Four regions I, II ,III and IV the magnetic field is given by I . By = Bo sinkz II . By = Bo

04:29

Q6 In an ac circuit, the instantaneous values of current ( inA ) and voltage ( in V ) are in = 5 sin

04:00

A series LCR circuit is designed to resonate at an angular frequency wo = 10^5 rad/s . The circuit d

05:34

Q5 Which of the quantity/quantities remains same in primary and secondary coils of an ideal transfo

14:25

Two conducting rings of radii r and 2r move in opposite direction with velocity 2v and v respectivel

06:48

Q4 A circular coil of radius 10 cm is placed in a magnetic field vector B = ( 1.0 i + 0.5 j ) mT suc

05:47

Q3 The emf induced in a coil rotates in a magnetic field does not depend upon the following [ set 3

11:31

A uniform rod of mass m is moving with constant velocity vo in a perpendicular uniform magnetic fiel

07:25

Q31 A charge of 6 microC is given to a hollow metallic sphere of radius 0.2 m . Find the potential a

02:59

Q2 Electrons drift with speed vd in a conductor with potential difference V across its ends . If V i

05:43

Q1 Coulomb force F versus ( 1/r^2) graphs for two pairs of point charges ( q1 and q2 ) and ( q2 and

09:41

In the circuit shown below, the key K is closed at t= 0 . The current through the battery is [ NEET

10:42

A rectangular metal loop ABCD is moving in uniform transverse magnetic field B with constant veloci

08:14

A metallic rod of length l is hinged at one end . If it is rotated with angular velocity w in a plan

03:26

Q32 The magnetic flux through a coil of resistance 5 ohm increases with time as fi = ( 2 t ^3 + 5 t^

03:04

A copper rod of length 2 m moves in a transverse uniform magnetic field of 3 T . It is moving with c

05:30

A direct current of 4 A and an alternating current of peak value 4A passes through 3 ohm and 2 ohm r

06:32

In an AC generator, the magnetic flux linked with the rotating coil has maximum value fi and frequen

05:23

Q 32 A galvanometer of resistance G is converted into a voltmeter of range ( 0 - V ) by using a resi

03:58

What will be the direction of current in the coil A as the switch S is closed ?

01:35

Magnetic flux ( in Wb) linked with a closed loop varies with time to ( in s ) as fi = 2 t ^2 + 1 . T

02:04

A uniform magnetic field exists in space as vector B = 4 i T . The magnetic flux through an area v

05:50

A rectangular coil of area A, rotates in a uniform magnetic field B with angular velocity w about an

10:38

Q 33 The displacement of two light waves, each of amplitude a and frequency w, emanating from two c

07:23

Q33 In young's double slit experiment, find the ratio of intensities at two points on the screen wh

05:52

In LR circuit, key K is closed at t = 0 . Which of the following quantities is not zero at time eq

09:51

Q32 Two coplanar and concentric circular loops L1 and L2 are placed coaxially with their centres coi

11:03

A positive charge q moves along the line AB, which lies in the same plane as a circular loop of con

06:55

A coil of radius r is placed at center of large coil of radius R , where R greater than r and coils

07:53

Q32 b(i) A rectangular coil of N turns and area of cross section A is rotated at a steady angular sp

08:01

Q33 (ii ) In the figure, a ray of light is incident on a transparent liquid contained in a thin gla

23:17

Q 29 The figure shows four pairs of parallel identical ...... Section - D Case Study Based Question

05:22

Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a consta

06:36

An LCR circuit contains resistance of 110 ohm and a supply of 220 V at 300 rad /s angular frequency.

05:09

A conducting rod AB of length l is projected on a frictionless frame PSRQ with velocity vo at any in

04:01

A series LCR circuit driven by 300 V at a frequency of 50 Hz contains a resistance R = 3kohm , an i

14:02

Q28 Draw the circuit diagrams for obtaining the V- I characteristics of p- n junction diode. Explai

09:04

A copper disc of radius 0.1m is rotated about its central with 10 rev/s in a uniform magnetic field

06:26

Find the peak current and resonant frequency of the following circuit [ JEE 26 Feb, 2021 shift 2 ]

11:00

Q27 (a) Define atomic mass unit (u) . (b) Calculate the energy required to separate a deutron into i

09:19

Q26 State Bohr's second postulate for his theory of hydrogen atom . Prove that the radius of Bohr's

12:08

Q25 The electric field in an electromagnetic wave in vacuum is given by vector E = 6.3 N/C[ cos ( 1.

09:19

Q 23 An electron ( charge - e , mass m ) is revolving around a nucleus in a hydrogen atom , in a cir

07:39

Q22 A current of 1.6 A flows through a wire when a potential difference of 1 V is applied across it.

06:55

Q 21 Suppose a pure Si crystal has 5× 10^28 atom /m^3 . It is doped by 1 ppm concentration of Boron

08:55

Q20 Light of wavelength 600 nm is incident on potassium ( work function 2.3 eV ) . Will photoemissi

06:08

Q18 The magnifying power of an astronomical telescope is 24 . In normal Adjustment, distance betwee

05:34

Q16 Assertion (A) : A convex lens , when immersed in a liquid, disappears . Reason (R) : The refrac

04:06

Q15 Assertion (A) : A proton and an electron enter a uniform magnetic field B with the same momentum

05:19

Q14 Assertion (A) : Photoelectric effect demonstrates the particle nature of light . Reason (R ) : P

04:37

Q13 Assertion A : In a semiconductor, the electron in the conduction band have lesser energy than t

04:55

Q12 Si is doped with a pentavelent element. The energy required to set the additional electron free

08:26

Q11 An electron makes a transition from n = 2 level to n = 1 level in the Bohr model of a hydrogen

03:43

Q10 The wavelength of matter wave associated with an electron of kinetic energy K is lemda. If the

03:03

An in a series LCR circuit, the inductive reactance XL is 10 ohm, and the capacitive reactance XC i

05:57

Q 16 Assertion: In interference and diffraction of light, light energy reduces in one region produci