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Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Find The Displacement Of The Particle When Its Velocity Is Zero

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

Question: The displacement of a particle moving in one dimension under the action of a constant force is related to the time t by the equation t = square root of x + 3, where x is in metre and t is in second. Find the displacement of the particle when its velocity is zero Answer: read more

Question:

The displacement of a particle moving in one dimension under the action of a constant force is related to the time t by the equation t = square root of x + 3, where x is in metre and t is in second. Find the displacement of the particle when its velocity is zero

Answer:

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Comments Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

Question: A nucleus with mass number A = 240 and BE/A = 7.6 MeV breaks into two fragments each of A = 120 with BE/A = 8.5 MeV. Calculate the released energy Or Calculate the energy in fusion reaction: Answer: read more

Question:

A nucleus with mass number A = 240 and BE/A = 7.6 MeV breaks into two fragments each of A = 120 with BE/A = 8.5 MeV. Calculate the released energy Or Calculate the energy in fusion reaction:

Answer:

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Comments Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching

Discuss The Role Of Statistics In Economic Planning

Sujoy D.

1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....

Statistics are used in economic planning for the following purposes: (i) Statistical data help us in comparing the rate of development of one country with the rate of development of the other country. (ii) The importance of consumption, production, distribution etc can be known from the available statistical... read more

(i) Statistical data help us in comparing the rate of development of one country with the rate of development of the other country.

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Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Use Biot-Savart Law To Derive The Expression For The Magnetic Field

Sujoy D.

Use Biot-Savart law to derive the expression for the magnetic field on the axis of a current carrying circular loop of radius R. Draw the magnetic field lines due to a circular wire carrying current. Let us consider a circular loop of radius a with centre C. Let the plane of the coil be perpendicular... read more

Use Biot-Savart law to derive the expression for the magnetic field on the axis of a current carrying circular loop of radius R. Draw the magnetic field lines due to a circular wire carrying current.

Let us consider a circular loop of radius a with centre C. Let the plane of the coil be perpendicular to the plane of the paper and current I be flowing in the direction shown. Suppose P is any point on the axis at direction r from the centre.

Let us consider a current element dl on top (L) where, current comes out of paper normally whereas at bottom (M) enters into the plane paper normally.

Now, magnetic field at P due to current element at L according to Biot-Savart Law,

Magnetic field due to Circular wire carrying current I.

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Comments Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Sujoy D.

Question: A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of ray through the prism. From which face will the ray emerge ? Justify your answer. Answer: read more

Question:

A ray PQ incident normally on the refracting face BA is refracted in the prism BAC made of material of refractive index 1.5. Complete the path of ray through the prism. From which face will the ray emerge ? Justify your answer.

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Comments Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Derive An Expression For Drift Velocity Of Free Electrons

Sujoy D.

Derive an expression for drift velocity of free electrons. How does drift velocity of electrons in a metallic conductor vary with increase in temperature ? Explain. (i) When conductor is subjected to an electric field E, each electron experience a force. F=-eE and acquires an acceleration a = F/m =... read more

Derive an expression for drift velocity of free electrons.

How does drift velocity of electrons in a metallic conductor vary with increase in temperature ? Explain.

(i) When conductor is subjected to an electric field E, each electron experience a force.

F=-eE

and acquires an acceleration

a = F/m = - eE/m -----(i)

Here m = mass of election, e = charge, E = electric field.

The average time difference between two consecutive collisions is known as relaxation time of election.

(ii) According to drift velocity expression, relaxation time is the time interval between successive collisions of an electron on increasing temperature, the electrons move faster and more collisions occur quickly. Hence, relaxation time decreases with increase in temperature which implies that drift velocity also decreases with temperature.

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Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Determine The EMF Of The Primary Cell Which Gives A Balance Point At 40cm

Sujoy D.

A potentiometer wire of length 1 m has a resistance 10 ohm It is connected to 6V battery in series with a resistance of 5 ohm. Determine the emf of the primary cell which gives a balance point at 40 cm. Current flowing in potentiometer wire, I = V/R +R’ I = 6/10+5 A = 0.4 A Potential drop across... read more

A potentiometer wire of length 1 m has a resistance 10 ohm It is connected to 6V battery in series with a resistance of 5 ohm. Determine the emf of the primary cell which gives a balance point at 40 cm.

Current flowing in potentiometer wire,

I = V/R +R’

I = 6/10+5 A = 0.4 A

Potential drop across the potentiometer wire

V =IR

= 0.4 x 10 V = 4.0 V

Potential gradient k = V/l = 4.0 V/m

.’. Unknown emf of the cell (E) = kl’

= 4.0 x 4V=1.6V

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Comments Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Calculate The Potential V And The Unknown Capacitance C

Sujoy D.

A capacitor of unknown capacitance is connected across a battery of V volts. The charge stored in it is 360 pC. When potential across the capacitor is reduced by 120 V the charge stored in it becomes 120 pC. Calculate: (i) The potential V and the unknown capacitance C. (ii) What will be the charge stored... read more

A capacitor of unknown capacitance is connected across a battery of V volts. The charge stored in it is 360 pC. When potential across the capacitor is reduced by 120 V the charge stored in it becomes 120 pC.

Calculate:

(i) The potential V and the unknown capacitance C.

(ii) What will be the charge stored in the capacitor, if the voltage applied had increased by 120 V?

Answer:

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Comments Lesson Posted on 24 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Sujoy D.

Question: wo point charges + q and -2q are placed at the vertices ‘B’ and ‘C of an equilateral triangle ABC of side ‘a’ as given in the figure. Obtain the expression for (i) the magnitude and (ii) the direction of the resultant electric field at the vertex A due to these... read more

Question:

wo point charges + q and -2q are placed at the vertices ‘B’ and ‘C of an equilateral triangle ABC of side ‘a’ as given in the figure. Obtain the expression for (i) the magnitude and (ii) the direction of the resultant electric field at the vertex A due to these two charges.

Answer:

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Answered on 17/12/2017 Exam Coaching/Engineering Entrance Coaching/GATE Coaching Tuition/BTech Tuition/BTech Mechanical Engineering

Please share the preparation tips for GATE 2018. What are the important topics subject wise for Mechanical Engineering?

Terzaghi Institute

Third year is the right time to prepare gate, even though you can appear in the final year. Starting the preparation in 3rd year will give you confidence and you will score very high marks in the final year.

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