JEE-Main - Grade 12 - Physics - Atoms - Introduction and Snapshot of Atoms - Study ref# 839

Introduction:
By the nineteenth century, enough
evidence had accumulated in favour of atomic hypothesis of matter. In 1897,
the experiments on electric discharge through gases carried out by the
English physicist J.J. Thomson (1856 - 1... read more

JEE-Main - Grade 12 - Physics - Alternating Current - Introduction and Snapshot of Alternating Current - Study ref# 825

Following section must be covered to
understand the Alternating Current:
1. Introduction
2. AC Voltage Applied to a Resistor
3. Representation of AC Current and
Voltage by Rotating Vectors – Phasors
4. AC Voltage Applied to an In... read more

JEE-Main - Grade 11 - Physics - Oscillations - Importance and Snapshot of Oscillations - Study ref# 730

Introduction:
The study of oscillatory motion is basic to physics; its
concepts are required for the understanding of many physical phenomena. In
musical instruments like the sitar, the guitar or the violin, we come across
vibrating st... read more

JEE-Main - Grade 11 - Physics - Oscillations - Importance and Snapshot of Oscillations - Study ref# 731

Following sections must be covered to understand
Oscillations:
1. Introduction
2. Periodic and oscillatory motions
3. Simple harmonic motion
4. Simple harmonic motion and uniform circular motion
5. Velocity and acceleration in si... read more

JEE-Main - Grade 11 - Physics - Oscillations - Target Setup for Oscillations - Study ref# 732

Student requires to achieve the following milestones to get better grip over Oscillations. The milestones / targets are as follows:- Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Test000%S... read more

What is the total distance travelled by a body executing
SHM in a time equal to its time period, if its amplitude is A? Answer: Total distance travelled in time T is .... read more

On an average a human heart is found to beat 75 times in a
minute. Calculate its beat frequency and period. Answer: The beat frequency of heart is
The time period read more

What force keep the simple pendulum in simple harmonic
motion? Answer: The component of weight due to gravitational force ( i.e. keeps
the simple pendulum in simple harmonic motion.... read more

A vibrating simple pendulum of period T is placed in a
lift which is accelerating upwards. What will be the effect on the time
period? Answer: As effective value of acceleration due to gravity
increases i.e. read more

Can a pendulum watch give correct time in an artificial
satellite? Explain. Answer: No, in an artificial satellite, the body is in
weightlessness condition, where g = 0. The time period of pendulum watch
read more

What are the phase relationship between displacement,
velocity and acceleration in SHM? Answer: In SHM, the velocity leads the displacement by a phase radians
and acceleration leads velocity ... read more

The period of vibration of a mass m suspended by a spring
is T. the spring is cut into n equal parts and the body is again suspended by
one of the pieces. Find the time period of oscillation of the mass. Answer: Let k be the spring constant of ... read more

A girl sitting on a swing stands up. What will be the
effect on the periodic time of the swing? Answer: The time period, T will decrease.
Reason: In the standing position, the position of centre
of mass of the girl shifts upwards. Due to ... read more

At what displacement (i) the potential energy of a simple
harmonic oscillator is maximum and minimum (ii) the kinetic energy is maximum
and minimum? Answer: (i) The
potential energy of a particle executing SHM is give... read more

The amplitude of a simple harmonic oscillation is doubled.
How does this affect (i) periodic time (ii) maximum velocity (iii) maximum
acceleration and (iv) maximum energy? Answer: (i) Time
period of oscillation of sim... read more

What do you mean by resonance?
Amplitude of a wave is represented by .
Under which conditions, resonance will occur? Answer: The phenomenon of increasing
amplitude when the driving force i... read more

Derive the expression for potential energy and kinetic
energy of a simple harmonic motion represented by .
Answer: Displacement of simple harmonic motion is read more

Show that total energy of a simple harmonic motion is
constant and draw the curve for potential energy, kinetic energy and total
energy with time for displacement equation Answer: For displac... read more

Derive the expression for frequency of a simple pendulum. Answer:
A simple pendulum is defined as a
bob of mass m suspended from a point O by a string of length and of
negligible mass.
When the bob is pulled aside from
its mean posi... read more

Derive the expression for frequency of a spring-block
system when the block is kept on a floor and other side of spring is attached
to a rigid wall. Answer:
Suppose a block of mass m is
attached to the free end of a massless spring of ... read more

Derive the expression for average potential energy and
average kinetic energy for a simple harmonic oscillator represented by and
show that total energy of a simple harmonic oscillator is equ... read more

What is the percentage change in the time period, if the
length of simple pendulum increases by 3%? Answer: Time period of simple pendulum of length
Now taking log one both sides of the equ... read more

What is the frequency of a second’s pendulum in an
elevator moving up with an acceleration of ? Answer: Time period of second pendulum is
So, frequency read more

The period of oscillation of a mass m kg is suspended by
an ideal spring is 1.5 sec. if an additional mass 3 kg be suspended, the time
period is increased by 1 sec, find the value of m. Answer: In first case, read more

A body weighing 10 kg is executing SHM, has a velocity of
6 ms-1, after one second of starting from the mean position, find
its kinetic energy, potential energy and total energy. Given, its time period
is 6 second. Answer: Given that, m = 10... read more

What is the ratio between the potential energy and the
total energy of a particle executing SHM, when its displacement is half of
its amplitude? Answer:
... read more

A particle is executing S.H.M Identify the positions of
the particle where:
1. K.E. of the particle is zero.
2. P.E. is zero.
3. P.E. is one fourth of the total energy.
4. P.E. and K.E. are equal. Answer: 1. At extreme position ... read more

JEE-Main - Grade 12 - Physics - Electrostatic Potential and Capacitance - Study ref# 10487

Calculate the potential energy of a point
charge –q placed along the axis due to a charge +Q uniformly distributed
along a ring of radius R. Sketch potential energy as a function of axial
distance z from the centre of the ring. Looking at gr... read more

JEE-Main - Grade 12 - Physics - Magnetism and Matter - Study ref# 10541

A bar magnet of magnetic moment m and
moment of inertia I(about center, perpendicular to length) is cut into two
equal pieces, perpendicular to length. Let T be the period of oscillations of
the original magnet about an axis through the mid-... read more

A rectangular frame of wire is placed in
a uniform magnetic field directed outwards, normal to the paper. AB is
connected to a spring which is stretched to and then
released at time t = 0.... read more

JEE-Main - Grade 12 - Physics - Alternating Current - Study ref# 10569

Show that in the free oscillations of an
LC circuit, the sum of energies stored in the capacitor and the inductor is
constant in time. Answer: At an instant t, charge q on the
capacitor and the current i are given by:
read more