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Subject: Physics, asked on 9/6/16

A certain circuit with a resistance R is supplied with power simultaneously from N identical storage batteries. If the current in the circuit is to be the same whether the batteries are connected in series or parallel, the internal resistance of each storage batteries should be equal to 
A) R/2
B)R/4
C)R
D)2R

Pl ans fast with reason...

Subject: Physics, asked on 9/6/16

​An external resistance R is connected to a cell of emf E and internal resistance r. The power developed in the external circuit is maximum when
A) R > r
B) R<r
C) R=r 
D) R = 0

Pl ans fast with reason..

Subject: Physics, asked on 9/6/16

In the given network, the equivalant resistance between A and D is

Subject: Physics, asked on 25/5/16

It is said that the earth is zero potential so that earthing is done to prevent electric shocks. Is there any point of time when the earth gets electrified?

Subject: Physics, asked on 26/4/16

solve it

Subject: Physics, asked on 20/4/16

Electric Field is Described as E(r) = kQr-2, please explain what is r over here. the radius of electric field?? if it is the r = infinity??

Subject: Physics, asked on 31/3/16

If emfof a cell = terminal voltage + voltage drop, then why is the emfof a cell always the same irrespective of the current drawn from the cell ? If more current is drawn, then the terminal voltage should increase and thus the emf too. Voltage drop is not affected by the amount of current drawn from the cell. Then why does emf of a cell always remain constant ?

Subject: Physics, asked on 4/12/15

A current carrying conductor has equal number of protons and electrons at any segment of it Is it charged? If charged, what is the nature of this charge? what sort of force is applied on a unit positive charge? it is attractive or repulsive?

Subject: Physics, asked on 23/11/15

A charge is moving with velocity u in a direction noRmal to uniform magnetic field of B and away from the plane of the paper A man is also moving with that moving charge at the same velocity in the same direction. The man sees the charge at rest since the relative velocity of the charge wrt man is zero. Shall the charge experience any force with respective to the above man moving along with the charge?
How much is the force on the charge seen and measured by the man?

Subject: Physics, asked on 22/11/15

a current carrying conductor has magnetic field around it and attracts magnetic ploes but does it also apply force on a static charge ? why ?

Subject: Physics, asked on 22/11/15

A current carrying conductor has magnetic field around it. Does it have electric around it also? Does a current carrying conductor apply force on a static chargeplaced at some distance from the current carrying conductor ?

Subject: Physics, asked on 1/9/15

The resistivity of two materials A and B are 100*10^-6 ohm and 1.6*10^-8 ohm. Which of them will you select for transmission lines, heating coils of electronic iron and making handles of electrical applainces.

Subject: Physics, asked on 1/9/15

A current of 2A produces 200 J of heat in a wire in a given period of time.If the current is increased to 4A,how much heat will be produced in the same time?

Subject: Physics, asked on 1/9/15

two resistances R1 and R2 are present in parallel and a battery of V volts is also present.It is given that R1 is greater than R2.Which resistance will consume more power and why?

Subject: Physics, asked on 3/8/15

State the law which governs the amount of heat produced in a metallic conductor when electric current is passed through it for a given time, Express this law mathematically.

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