Induced Emf

CBSE XII Science Physics Electromagnetic Induction

I am trying but.. I am stuck.. please help..

 

Asked by nitishkrnehu09 18th November 2017 10:45 PM

Answered by Expert

how would you detect the presence of magnetic field on an unknown planet

CBSE X Physics Magnetic Effects of Electric Current

Q.  A Coil of insulated copper wire is connected to a galvanometer.  What will happen if a bar magnet is :

a) Pushed into the  coil. 

b) Withdrawn from the coil. 

c) Held stationary near the coil. 

Draw diagarm to represent each situation and explain the deflection in the galvanometer. 

NEET1 NEET1 Electromagnetic Induction and Alternating Currents

q

NEET1 NEET1 Electromagnetic Induction and Alternating Currents

Q.

NEET1 NEET1 Electromagnetic Induction and Alternating Currents

Q

NEET1 NEET1 Electromagnetic Induction and Alternating Currents

Q

CBSE XII Science Physics

a bar magnet m is dropped vertically through the coil C.Draw the of the graph between emf induced in the coil vs time,Why is the negative peak longer than the positive peak?  

ICSE X Physics

the magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.

CBSE XII Science Physics

In this question I am not able to understand that why the area of circle is not constant whereas the area of rectangle is constant.

CBSE X Physics

list an additional method of inducing current in a coil.

CBSE XII Science Physics

a metal disc of radius 200cm is rotated at a constatnt angular speed of 60 rads¯¹ in a plane at right angle to an external uniform magnetic field of magmetics induction 0.05 T.find the emf induced between the centre and a point on the rim.

CBSE XII Science Physics

A RECTANGULAR AND CIRCULAR LOOP ARE MOVING OUTOF THE UNIFORM MAGNETIC FIELD REGION WITH UNIFORM VELOCITY. IN WHICH LOOP WILL THE INDUCED EMF BE MORE?

JEE Plances JEE (Main) Physics

Ques 15

NEET1 NEET1 Physics

A square of side 0.5 m has movable sides. It is placed such that it's plane is perpendicular to the field of induction 0.2 T . If all the sides are allowed to move with a speed of 0.1 m/s for 4 s outwards , average induced emf is

NEET1 NEET1 Physics

A square loop of side 'a' is placed in the same plane as a long straight wire carrying a current i . The nearer side of loop is at a distance 'a' from the wire . The loop is moved away from the wire with a constant velocity v . The induced emf in the loop is

NEET1 NEET1 Physics

A conducting circular loop is in perpendicular magnetic field of 0.01 T . If the radius of the loop starts shrinking at a uniform rate of 1 mm/s  , then the emf induced in the loop at the instant when it's radius is 10cm will be

NEET1 NEET1 Physics

A bar magnet is dropped so that it falls vertically through coil .the graph obtained for induced emf wiil be

CBSE X Physics Magnetic Effects of Electric Current

A coil has 1000 turns and 500cm^2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2×10^-5 wb/m^2. The coil is rotated through 180° in 0.2 seconds. Find the average emf induced in the coil.

CBSE XII Science Physics Electromagnetic Induction

All

JEE Main Physics Current Electricity

sir please solve and explain the solution

CBSE XII Science Physics

kindly Answer thans

CBSE XII Science Physics

Hello  In motional emf q.wen there is rec loop placed in B ...and arm pq moves ..if velocity is towards right then v is positive and neg on left ?is it right ??so in case of right velocity ...emf is blv and not -blv right ?

CBSE XII Science Physics

A jet plane is travelling west 450m/s  if horizontal component of earth magnetic feild is 4×10^-4 &angle of dip is 30.find emf induced b/w the ends of wings having span 30m?

CBSE XII Science Physics

Please help me with the torque part . How is the direction of the torque in clockwise direction and to keep the rod rotating it must me in anticlockwise direction?? 

NEET NEET Physics

When a coil and a magnet move with their constant speeds 5 m/s and 3 m/s respectively towards each other the induced emf in the coil is 16 mV. if both move in the same direction why does the induced emf get reduced to 4mV in the coil ? 

CBSE X Physics

Will the rod remain neutral?

CBSE XII Science Physics

Pl ans experts

CBSE XII Science Physics

Why do only 2 opposite sides of a rectangular coil have motional emf and not all? Why only AD will have emf and not AB, CD

CBSE XII Science Physics

Pl ans 

CBSE XII Science Physics

Pl ans 

NEET NEET Physics Electromagnetic Induction and Alternating Currents

⭕Please Explain all three cases un details...thanQ 🙂

JEE Main Physics Electromagnetic Induction and Alternating Currents

A circular loop of wire of radius a is placed in a uniform magnetic field, with the plane of the loop perpendicular to the direction of the field. The magnetic field varies according to B(t) =B°+bt calculate   Magnetic flux Induced emf in loop Induced current and its direction  Power dissipated

NEET NEET Physics

A triangular loop is given in x-y plane. A current carrying wire is placed perpendicular to the plane. If current starts increasing at the rate of R, then find emf induced in the loop.

CBSE XII Science Physics Alternating Current

a horizontal straight wire 10m long extending from east to west is falling with a speed of 5m/s at right angles to the horizontal component of the earth magnetic field 0.30  

NEET NEET Physics

The square loop of side length 2cm is induced in the magnetic field of 3T with a speed of 1cm/s. Find out the induced EMF after 1s, 5s and 25s. The square loop is being moved towards right at a constant speed 1 cm/s.

CBSE XII Science Physics

Assertion when a metallic square moves inside a uniform magnetic field then there is no induced emf in it. Reason, EMF is induced when there is a rate of change of magnetic flux

NEET NEET Physics Electromagnetic Induction and Alternating Currents

Find the motional emf in a closed loop ABCD. Answer comes out to be 2RBV. I have two doubts In it's concept. 1) here why we are calculating the emf by breaking the loop into two halves instead of considering effective length to be 0 since it is a closed loop? 2) in the 2nd figure attached below question figure we are saying that emf induced in 2nd loop is 0 since flux through it is constant. Why we are not considering this case in this question. I request you to answer my these 2 doubts in detail, so that my concept becomes clear

JEE Main Physics Electromagnetic Induction and Alternating Currents

A square loop side 20 cm is initially kept 30 cm away from a region of uniform magnetic field of 0.1 T .It is then moved towards right with a velocity of 10 mper sec till it goes out of the field plot a graph showing EMF vs t.

NEET NEET Physics Magnetic Effects of Current and Magnetism

Magnetic field linked through a coil of 50Ω resistance varies with time as shown in graph. Draw (emf v/s t) graph 

CBSE XII Science Physics Electromagnetic Induction

why EMF is induced before current in the experiment dobe by Faraday?

CBSE XII Science Physics Electromagnetic Induction

A rod of iron and length 1 m fixed at one end is rotating with angular velocity 200 rad/s about the fixed end in a magnetic field of 0.2 T. Find the induced emf between the centre and far end of the road.

JEE Main Physics Electromagnetic Induction and Alternating Currents

In this sir has not taken potential across the non conducting part. But we know theat emf is alse induced in non conductor like wood. Then why sir neglected it 

CBSE XII Science Physics Electromagnetic Induction

a conductor 0.20m long is moved in a field of strength o.o5T with a speed of 0.30 ms‐¹. find , in volt ,e.m.f induced in it , if it is moved at right angles to both its length and the field.

CBSE XII Science Physics Electromagnetic Induction

A coil of N turns is placed in a magnetic field B such that B is perpendicular to the plane of the coil. B changes with time as B=B0 cos 2元 where T is time period. The magnitude of emf-induced in the coil will be maximum at

NEET NEET Physics Electromagnetic Induction and Alternating Currents

EmI lesson