An ellipse with semi major axis 'a' semi minor 'b' revolving in uniform magnetic field'B'. Find value of average of joule heating (resistance =R)

An elliptical loop having resistance R, of semi major axis a, and semi minor axis b is placed in a magnetic field as shown in the figure. If the loop is rotated about the x-axis with angular frequency omega , the average power loss in the loop due to Joule heating is :

Shows a rod of length l and resistance r moving on two rails shorted by a resistance R . A uniform magnetic field B is present normal to the plane of rod and rails. Show the electrical equivalence of each branch.

Shows a rod of length l and resistance r moving on two rails shorted by a resistance R . A uniform magnetic field B is present normal to the plane of rod and rails. Show the electrical equivalence of each branch.

A coil of radius R rotating about a diametrical axis with angular velocity 'omega' in a uniform magnetic field B. Find the value of maximum voltage developed R = 10cm B = 5 x 10^(-5) T. For half rotation it takes a time of 0.2 sec

The major axis of an ellipse is twice its minor axis. Find its eccentricity.

If the length of the latus rectum of an ellipse with major axis along x-axis and centre at origin is 20 units, distance between foci is equal to length of minor axis, then find the equation of the ellipse.

A negatively charged particle enters in a semi-infinite uniform magnetic field vecB, directed out the plane of paper as shown in the figure. Through what angle it is is deviated when it leaves the magnetic field?

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

A conducting ring of radius r and resistance R is placed in region of uniform time varying magnetic field B which is perpendicular to the plane of the ring. It the magnetic field is changing at a rate alpha , then the current induced in the ring is

Point 'O' is the centre of the ellipse with major axis AB & minor axis CD. Point F is one focus of the ellipse. If OF = 6 & the diameter of the inscribed circle of triangle OCF is 2, then find the product (AB).(CD)