A wire loop enclosing a semicircle of radius `R` is located on the boundary of a uniform magnetic field `B`. At the moment `t = 0`, the loop is set into rotation with constant angular acceleration `alpha` about an axis `O`. The clockwise emf direction is taken to be positive.


The variation of emf as a function of time is

A wire loop enclosing a semicircle of radius R islocated on the boundary of a uniform magnetic field B . At the moment t = 0 , the loop is set into rotation with constant angular acceleration alpha about an axis O . The clockwise emf direction is taken to be positive. The variation of emf as function of time is

A wire loop enclosing as semicircle of radius R is located on the boudary of uniform magnetic field B . At the moment t=0 , the loop is set into rotation with a costant angular acceleration alpha about an axis O coinciding with a line of vector B on the boundary. Find the emf induced in the loop as a function of time. Draw the approximate plot of this function.The arrow in the figure shows the emf direction taken to be positive.

A wire loop enclosing a semi-circle of radius a=2cm is located on the boundary of a uniform magnetic field of induction B=1T (figure).At the moment t=0 the loop is set into rotation with a constant angular acceleration beta=2 rad//sec^(2) about an axis O coinciding with a line of vector B on the boundary.The emf induced in the loop as a function of time t is [x xx10^(-4)(-1)^(n)xxt]V , where n=1,2,... is the number of the half-revolution taht the loop performs at the given moment t .Find the value of x .(The arrow in the figure shows the emf direction taken to be positive, at t=0 loop was completely outside)

A circular loop of metal wire of radius r is placed perpendicular to uniform magnetic field B. Half of the loop is folded about the diameter with constant angular velocity omega . If resistance of the loop is R then current in the loop is

A circular coil of radius r is placed in a uniform magnetic field B. The magnetic field is normal to the plane of the coil is rotated at an angular speed of omega , about its own axis , then the induced emf in the coil is __

A circular wire loop of radius r is placed in a region of uniform magnetic field B such that the plane of the loop makes an angle theta with the direction of B. In which of the following conditions, will no emf be induced in the loop?

A uniform circular loop of radius a and resistance R palced perpendicular to a uniform magnetic field B . One half of the loop is rotated about the diameter with angular velocity omega as shown in Fig. Then, the current in the loop is

A circular loop of radius r , having N turns of a wire, is placed in a uniform and constant magnetic field B . The normal of the loop makes an angle theta with the magnetic that the angle theta is constant. Choose the correct statement from the following.

A space is divided by the line AD into two regions. Region I is field free and the region II has a uniform magnetic field B directed into the paper. ACD is a semicircular conducting loop of radius r with centre at O, the plane of the loop being in the plane of the paper. The loop is now made to rotate with a constant angular velocity  about an axis passing through O, and perpendicular to the plane of the paper in the clockwise direction. The effective resistance of the loop is R. Plot a graph between the induced emf and the time of rotation for two periods of rotation.