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Subject: Physics, asked on 8/1/18

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13. a. Derive an expression for maximum induced emf produced by an AC  generator.
b. Draw a graph to show the variation of induced emf with time for one complete cycle of the armature coil. c. Draw graphical variation of magnetic flux linked with the armature coil with time for one complete cycle of the armature coil.
OR
 
a. Derive an expression for average power consumed by a series LCR circuit from AC source of voltage V(t) = V(0) Sinωt
b. A bulb is connected to series combination of inductor and capacitor along with an AC source. Explain the change in brightness of the bulb as frequency of the source is increased from zero to infinity.

Subject: Physics, asked on 5/1/18

17.  A metallic rod held horizontally along east - west direction, is allowed to fall under gravity.  Will there be an emf induced at its ends?  Justify your answer.

Subject: Physics, asked on 5/1/18

43.  A flexible wire of irregular shape, abcd, as shown in the figure, turns into a circular shape when placed in a region of magnetic field which is directed normal to the plane of the loop away from the reader.  Predict the direction of the induced current in the wire.

                                                       

Subject: Physics, asked on 5/1/18


Q. Predict the direction of induced currents in metal rings 1 and 2 lying in the same plane where current I in the wire is increasing steadily.

 

Subject: Physics, asked on 4/1/18

???

Subject: Physics, asked on 3/1/18

Subject: Physics, asked on 2/1/18

4 and 5 are my doubts.

Subject: Physics, asked on 2/1/18

Show that the peak EMF induced in a coil rotating in a uniform magnetic field about an Axis which is perpendicular to the field direction is directly proportional to the angular speed of the coil.

Subject: Physics, asked on 22/12/17

A current carrying infinitely long wire is kept along the diameter of a circular wire loop without touching it. What will be the net magnetic flux from the circular loop? Plz give detailed answer. (Earlier, I had asked the same question but the posted answer by an expert was not opening.) 

Subject: Physics, asked on 21/12/17

My doubt is 19th question.

Subject: Physics, asked on 21/12/17

​in a region of space magnetic field exists in a cylindrical region of radius a , centred at origin with magnetic field along negative z direction. the field is given by -Bt k . the force experienced by a stationary charge q placed at (r,0,0) , where r>a is 

Subject: Physics, asked on 10/12/17

What does the slope of the line  between stopping potential and frequency represent?
 

Subject: Physics, asked on 5/12/17

solve

Q 1 0) The current through the switch S as a function of time for the following circuit would be ____________.  (Consider the switch to be closed at time t =  0 second) 

Subject: Physics, asked on 2/12/17

I didn't understand lenz law to find the direction of induced current..is there any trick to find the direction of the induced current.. ?
How to find the direction of induced current in like circuit below? 
 

Subject: Physics, asked on 2/12/17

How do we in which direction flux is decreasing.. and how to find the direction of induced current ? Explain briefly..

​i didn't understand lenz law.. 

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