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Books by Author Lovekush Kumar

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Physics

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Society

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Excellence

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Human Values

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Education

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Appreciation and Promotion

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कुछ सवाल

सामाजिक स्थिति को लेकर कुछ जरुरी सवालों के लिए क्लिक करें।

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लघु कहानियां

लेखक द्वारा सामाजिक तानेबाने पर लिखित कुछ कहानियों के लिए क्लिक करें।

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भौतिकी (Physics in Hindi)

हिन्दी में भौतिकी की समझ को बेहतर करने के लिए क्लिक करें।

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Recent Articles

Refraction, wavelength and frequency. Jamia Millia Islamia University BSc Nursing 2024

As you know that the speed decreases to 1/n  times the speed in air where n is the refractve index of glass w.r.t. air while frequency remains constant.

and as the eqaution V = µ * wavelength holds true in both cases the wavelenth also decreases  to 1/n  times the wavelength in air.

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Displacement current and Maxwell. Jamia Millia Islamia University BSc Nursing 2024

Maxwell had given maxwell's equation for electrodynamic, where he coined the word displacement current between plates of a capacitor due to variable electric field.

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Dependence of induced emf. Jamia Millia Islamia University BSc Nursing 2024

Take help from formula.

As we know that induced emf is given as rate of change of magnetic flux of the coil, so focus on the parameter

(i)rate of change  ........... related to option D

(ii)flux of the coil.......   related to option A & C

so option B is correct as  resistance comes into play when induced current is to be calculated.

 

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Direction of magnetic force on moving charged particle. Jamia Millia Islamia University BSc Nursing 2024

Force F is given as cross product of velocity and magnetic field multiplied my charge with sign.

So off course the force will be perpendicular to both V and B. (option D is correct)

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Maximum power, battery and resistor. Jamia Millia Islamia University BSc Nursing 2024

As you know that power is P=i^2  * R   where R is external resistance (load) and i is current drawn by it .

While i   =  E /(R+r) where r is internal resistance.

For maximum power R=r so P becomes E^2   /4r 

option D may be correct after the correction:- there should be r in denominator alongwith 4 .

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Electric dipole in uniform electric field. Jamia Millia Islamia University BSc Nursing 2024

Torque is given by PESin ø, where ø is angle between field E and dipole moment P so if angle ø is zero or 180 degree only then torque will be zero while net force will be zero always because both charges will experience equal and opposite force .

opposite as both charges have opposite nature.

same force because same electric field in the region and same magnitude of charge as F=qE; so both q and E to be looked for analysis.

Note- Uniform electric field means same direction and magnitude at any point in the region of uniform field.

 

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Shear Modulus of a liquid ? Jamia Millia Islamia University BSc Nursing 2024

As you know that the shear modulus, also known as the modulus of rigidity, is a measure of a material's resistance to shear deformation, and since liquids readily deform under shear stress (i.e. readily changes their shape on application of stress so it can be said that NO resisatance ), so their shear modulus is considered to be zero

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Dependence of inertia. Jamia Millia Islamia University BSc Nursing 2024

Mass

Inertia is related to heaviness or lightness.

Velociy is responsible for momentum while inertia can come into play when body is in rest also.

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Angle for maximum resultant of two vectors? Jamia Millia Islamia University BSc Nursing 2024

Two vectors will have their vector sum maximum when they act parallel i.e angle between them is zero, option A here.

For mathematical explanation refer to the formula of parallelogram, it will give that resultant (R) will be maximum when the angle is zero.

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Choose correct option having dimension different from other. Jamia Millia Islamia University BSc Nursing 2024

As we know that from our text book:- 

Work and energy has same dimensions so energy upon volume and work upon volume will have same dimensions while work is force*displacement   (W= F*d) so work/volume will have dimension of  Force/area as volume has dimension of area*length.

Similarly voltage*charge is nothing but work so volatge*charge/volume will have same dimension as work/volume that is same as that for A & B so A,B and D have same dimensions leading to C as correct answer (different from A, B & D)

 

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