Electromagnetic...

The current $$i$$ in an induction coil varies with time $$t$$ according to the graph shown in the figure. Which of the following graphs shows the induced emf ($$\varepsilon $$) in the coil with time?

In figure, if the current $$i$$ decreases at a rate $$\alpha$$, then $${V}_{A}-{V}_{B}$$ is

In the figure shown, a T-shaped conductor moves with constant angular velocity $$\omega$$ in a plane perpendicular, to uniform magnetic field $$\vec { B } $$. The potential difference $${V}_{A}-{V}_{B}$$ is

If the instantaneous magnetic flux and induced emf produced in a coil is $$\phi$$ and $$E$$ respectively, then according to Faraday's law of electro magnetic induction:

In figure, there is a conducting ring having resistance $$R$$ placed in the plane of paper in a uniform magnetic field $${B}_{0}$$. If the ring is rotating in the plane of paper about an axis passing through point $$O$$ and perpendicular to the plane of paper with constant angular speed $$\omega$$ in clockwise direction, then 

A wooden stick of length $$3l$$ is rotated about an end with constant angular velocity $$\omega$$ in a uniform magnetic field $$B$$ perpendicular to the plane of motion. If the upper one-third of its length is coated with copper, the potential difference across the whole length of the stick is

A horizontal straight conductor when placed along south-north direction falls under gravity; there is

A metal disc of radius $$a$$ rotates with a constant angular velocity $$\omega$$ about its axis. The potential difference between the center and the rim of the disc is ($$m=$$ mass of electron, $$e=$$ charge on electron)

Two identical cycle wheels (geometrically) have different number of spokes connected from center to rim. One is having $$20$$ spokes and the other having only $$10$$ (the rim and the spokes are resistanceless). One resistance of value $$R$$ is connected between center and rim. The current in $$R$$ will be

A uniform magnetic field exists in a region given by $$\vec { B } =3\hat { i } +4\hat { j } +5\hat { k } $$. A rod of length $$5m$$ along y-axis moves with a constant speed of $$1m$$ $${s}^{-1}$$ along x axis. Then the induced emf in the rod will be