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Almas asked a question
Subject: Physics, asked on on 27/2/17
A solenoid has 2000 turns wound over a length of 0.3 m. The area of its cross section is 1.2 × 10–3 m2. Around its central section a coil of 300 turns is wound. If an initial current of 2 A is reversed in 0.25 s, the e.m.f. induced in the coil is equal to
a) 6 x 10-4 V
b) 4.8 x 10-2 V
c) 2.4 x 10-2 V
d) 48 kV
The answer given is b . please explain how .. i m getting c
Prithesh Dwivedi asked a question
Subject: Physics, asked on on 19/8/17
A thin  non conducting  ring of mass m having  total charge q can rotate  freely about its own axis . Initially when  the ring is stationary, a magnetic field  B   directed perpendicular to the plane is  switched on. Fine the angular velocity w acquired by the  ring. Find also the induced magnetic moment.
Sandali Khare asked a question
Subject: Physics, asked on on 31/3/18
A coil of circular cross - section having 1000 turns and 4cm24cm2 face area is placed with its axis parallel to a magnetic field which decreases by 10−2Wbm−210−2Wbm−2in 0.01 s. The e.m.f induced in the coil is
Prithesh Dwivedi asked a question
Subject: Physics, asked on on 9/7/17
​pls solve attached Qno. ​
Muskan Ahluwalia asked a question
Subject: Physics, asked on on 17/9/17
a magnet is brought towards a coil 1 speedly 2 slowly then the induced emf/induced charge will be respectively
Manasi Mujumdar asked a question
Subject: Physics, asked on on 5/10/17
Two coils P and Q are kept near each other. When no current flows through coil P and current increases in
coil Q at the rate 10 A/s, the e.m.f. in coil P is 15 mV. When coil Q carries no current and current of 1.8 A
flows through coil P, the magnetic flux linked with the coil Q is
Prithesh Dwivedi asked a question
Subject: Physics, asked on on 1/7/17
​Pls solve attached Qno.14​
Ajay asked a question
Subject: Physics, asked on on 25/7/16
Pls explain Q.5
Aryan asked a question
Subject: Physics, asked on on 2/12/17
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.
Muskan Ahluwalia asked a question
Subject: Physics, asked on on 17/9/17
in a coil of area 10cmsquare and 10 turns with a magnetic field directed perpendicular to the plane and is changing at the rate of 10power8 gauss/s the resistance of the coil is 20 ohm the current in the coil will be
Aryan asked a question
Subject: Physics, asked on on 2/12/17
How magnetic field can be non-uniform from position point of view and from time point of view ?
Hemant asked a question
Subject: Physics, asked on on 2/10/17
The emf across ends of a conductor of length l moving with velocity v in region of magnetic feild B , is vBl , when v, B and l are mutually perpendicular. But v is velocity with respect to which frame of reference? Different observers can observe rod moving with different velocity and deduce different emf being generated. But if we connect ends of rod to an ammeter and resistance, it will show some current but that will not match current calculated by different observers. So v is measured wrt what?
Muskan Ahluwalia asked a question
Subject: Physics, asked on on 15/9/17
good evening sir sir u have done one ques i.e B=Bknot t cube is given uhave to find charge flown in time t in this u have found i=d/dt (Bknot tcube .piersquare) how this comes and solve the question upto end sir plz solve this
Muskan Ahluwalia asked a question
Subject: Physics, asked on on 16/9/17
in this question B=Bknot tcube is given how to finnd charge flown in time t as in the diagram magnetic field is cross and circle has raidus r
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