Electromagnetic...

A flat coil of 500 turns, each of area $$50 cm^2$$, rotates in a uniform magnetic field of $$0.14 Wb/m^2$$ about an axis normal to the field at an angular speed of $$150 rad/s$$. The coil has a resistance of $$5\Omega$$. The induced e.m.f. is applied to an external resistance of $$10\Omega$$. The peak current through the resistance is

Two coils X and Y are placed in a circuit such a current changes by 2 A in coil X and magnetic flux changes by 0.4 Wb in Y. The value of mutual inductance of the coils and its units are

The magnetic flux in a coil of 100 turns increases by $$12 \times { 10 }^{ 3 }$$ Maxwell in 0.2 s due to the motion of a magnet The emf induced in the coil will be :-

A circular ring of diameter $$20 \,cm$$ has a resistance of $$0.01 \Omega$$. The ring is turned from a position perpendicular to a uniform magnetic field of $$2T$$ to a position parallel to the field. The amount of charge flowing through the ring in this process is:

A semicircle loop $$PQ$$ of radius $$R$$ is moved with velocity $$'V'$$ in the transverse magnetic field as shown in the figure. The value of induced emf between the ends of the loop is : 

A circular arc of wire of radius of curvature r subtends an angle of $$ \frac {\pi}{4} $$ radian at its center. If i current is flowing in it then the magnetic induction at its centre will be:

A conducting square frame of side $$'a'$$ and a long straight wire carrying current $$l$$ are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity $$V$$. The emf induced in the frame will be proportional to

In a region of uniform magnetic induction  $$B = 10 ^ { 2 } T ,$$  a circular coil of radius  $$30\mathrm { cm }$$  and resistance  $$\pi ^ { 2 } ohm$$  is rotated about an axis which is perpendicular to the direction of  $$\mathrm { B }$$  and which forms a diameter of the coil, If the coil rotates at  $$200 rpm,$$  the amplitude of the alternating current induced in the coil is:

An aeroplane is flying horizontally with a velocity of 360 km/h. The distance between the tips of the wings of aeroplane is 25 m. The vertical component of earth's magnetic field is $$4\times { 10 }^{ -4 }$$ $$Wb/{ m }^{ 2 }$$. The induced e.m.f. is

Two identical coils A and B are arranged coaxially as shown in the figure and the sign conversation adopted is that the direction of currents are taken as positive when they flow in the direction of arrows. Which of the following statements is correct.