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Vivek Singh

Vivek Singh

HOD Physics @ Unacademy Bhilai

Former Director — Vibrant Academy | Former Faculty — Aakash Institute
In his free time, he provides career counseling on Dial Me 24/7

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The coefficient of linear expansion of steel and brass are 11×10−6/∘Cand19×10−6/∘C respectively. I

The coefficient of linear expansion of steel and brass are 11×10−6/∘Cand19×10−6/∘C respectively. I

January 18, 2025

Description The coefficient of linear expansion of steel and brass are 11*10^-6 and 19* 10^-6 respectively. If their difference in lengths at all temperature has to kept constant at Welcome to PhysicsMonk.com – India’s Largest Platform for Instant Doubt Solutions PhysicsMonk.com is the ultimate destination for instant video solutions to your doubts in Physics—from Class

A steel rod of length 1 m is heated from 25∘to75∘Ckeeping its length constant. The longitudinal str

A steel rod of length 1 m is heated from 25∘to75∘Ckeeping its length constant. The longitudinal str

January 18, 2025

Description A steel rod of length 1 m is heated from 25 to 75 degree celcius keeping its length constant. The longitudinal strain developed in the rod is (Given coefficient of linear expansion of steel = Welcome to PhysicsMonk.com – India’s Largest Platform for Instant Doubt Solutions PhysicsMonk.com is the ultimate destination for instant video

The magnetic field between the plates of a capacitor where r is less than R is given by ,where

The magnetic field between the plates of a capacitor where r is less than R is given by ,where

January 18, 2025

Description The magnetic field between the plates of a capacitor where r is less than R is given by (where r is the distance from the axis of plates and R is the radius of each plate of capacitor) Welcome to PhysicsMonk.com – India’s Largest Platform for Instant Doubt Solutions PhysicsMonk.com is the ultimate destination

An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity  6 × 10

An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity 6 × 10

January 18, 2025

Description An object is placed in a medium of refractive index 3. An electromagnetic wave of intensity 6 × 10 8 W / m 2 falls normally on the object and it is absorbed completely. The radiation pressure on the object would be (speed of light in free space = 3 × 10 8 m

Part 2 Revision oneshot EMI for NCERT/NEET Motional EMF,Energy consideration,Inductor and Inductance

Part 2 Revision oneshot EMI for NCERT/NEET Motional EMF,Energy consideration,Inductor and Inductance

January 17, 2025

Description Welcome to PhysicsMonk.com – India’s Largest Platform for Instant Doubt Solutions PhysicsMonk.com is the ultimate destination for instant video solutions to your doubts in Physics—from Class 11th to JEE Advanced and NEET level. With a growing library of over 15 lakh+ expert-created video solutions, we make learning fast, easy, and effective. Just click a

Revision Oneshot EMI Faraday’s and Lenz’s Law complete for NCERT and NEET (part 1)

Revision Oneshot EMI Faraday’s and Lenz’s Law complete for NCERT and NEET (part 1)

January 16, 2025

Description Welcome to PhysicsMonk.com – India’s Largest Platform for Instant Doubt Solutions PhysicsMonk.com is the ultimate destination for instant video solutions to your doubts in Physics—from Class 11th to JEE Advanced and NEET level. With a growing library of over 15 lakh+ expert-created video solutions, we make learning fast, easy, and effective. Just click a

A point source of 100 W emits light with 5% efficiency. At a distance of 5 m from the source,

A point source of 100 W emits light with 5% efficiency. At a distance of 5 m from the source,

January 15, 2025

Description A point source of 100 W emits light with 5% efficiency. At a distance of 5 m from the source, the intensity produced by the electric field component is (1) 1 2 π W m 2 (2) 1 40 π W m 2 (3) 1 10 π W m 2 (4) 1 20 π

A light ray is moving from A to B, separated by a distance d in vacuum. There is a

A light ray is moving from A to B, separated by a distance d in vacuum. There is a

January 15, 2025

Description A light ray is moving from A to B, separated by a distance d in vacuum. There is a slab of thickness r and refractive index n in the path, as shown. The electric field oscillation at A is given as E-E sin cot. If the speed of light in vacuum is c, the

Average force exerted on a non-reflecting surface at normal incidence is  2.4 × 10 − 4 N . If 360

Average force exerted on a non-reflecting surface at normal incidence is 2.4 × 10 − 4 N . If 360

January 15, 2025

Description Average force exerted on a non-reflecting surface at normal incidence is 2.4 × 10 − 4 N . If 360 W / c m 2 is the light energy flux during span of 1 hour 30 minutes. Then the area of the surface is: Welcome to PhysicsMonk.com – India’s Largest Platform for Instant Doubt

A thin spherical shell of radius R is cut into two equal halves and then each of its halves is charg

A thin spherical shell of radius R is cut into two equal halves and then each of its halves is charg

January 15, 2025

Description A thin spherical shell of radius R is cut into two equal halves and then each of its halves is charged to the same uniform surface charge density σ . If F is the force exerted on each half to keep them at equilibrium, then F is proportional to Welcome to PhysicsMonk.com – India’s

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