Electromagnetic...

A square of side L metres lies in the xy-plane in a region, where the magnetic field is given by \(B=B_0(2\hat i+3\hat j+4\hat k)\) T, where \(B_0\) is constant. The magnitude of flux passing through the square is

The self inductance L of a solenoid of length l and area of cross-section A, with a fixed number of turns N increases as

A metal plate is getting heated. It can be because

(a) a direct current is passing through the plate

(b) it is placed in a time varying magnetic field

(c) it is placed in a space varying magnetic field, but does not vary with time

(d) a current (either direct or alternating) is passing through the plate

An emf is produced in a coil, which is not connected to an external voltage source. This can be due to

(a) the coil being in a time varying magnetic field

(b) the coil moving in a time varying magnetic field

(c) the coil moving in a constant magnetic field

(d) the coil is stationary in external spatially varying magnetic field, which does not change with time

A circular coil expands radially in a region of magnetic field and no electromotive force is produced in the coil. This can be because

(a) the magnetic field is constant

(b) the magnetic field is in the same plane as the circular coil and it may or may not vary

(c) the magnetic field has a perpendicular (to the plane of the coil) component whose magnitude is decreasing suitably

(d) there is a constant magnetic field in the perpendicular (to the plane of the coil) direction