EASY
NEET
IMPORTANT
Earn 100

A square coil 10-2 m2 area is placed perpendicular to a uniform magnetic field of intensity 103 Wb m-2. The magnetic flux through the coil is  

81.25% studentsanswered this correctly

Important Questions on Electromagnetic Induction and Alternating Currents

MEDIUM
NEET
IMPORTANT
A field of 5×104π ampere-turns per meter acts at a right angle to a coil of 50 turns of area 10-2 m2. The coil is removed from the field in 0.1 second. Then the induced emf in the coil is
MEDIUM
NEET
IMPORTANT
A conducting rod is rotated about one end in a plane perpendicular to a uniform magnetic field with constant angular velocity. The correct graph between the induced emf (e) across the rod and time (t) is :
MEDIUM
NEET
IMPORTANT
A coil of 1000 turns is wound on a book and this book is lying on the table. The vertical component of the earth's magnetic field is 0.6×10-4 T and the area of the coil is 0.05 m2. The book is turned over once about a horizontal axis in 0.1 s. This average emf induced in the coil is
EASY
NEET
IMPORTANT

A metallic square loop ABCD is moving in its own plane with velocity v in a uniform magnetic field perpendicular to its plane as shown in the figure. An electric field is induced

Question Image

MEDIUM
NEET
IMPORTANT

The figure shows three regions of magnetic field, each of area A. In each region, the magnitude of magnetic field decreases at a constant rate α. If E is the induced electric field, then the value of the line integral, E.dl, along the given loop, is equal to

Question Image

MEDIUM
NEET
IMPORTANT

Figure shows three regions of magnetic field each of area A and in each region magnitude of magnetic field decreases at a constant rate α. If E is induced electric field, then value of line integral E·dr along the given loop is equal to,

Question Image

EASY
NEET
IMPORTANT
At time t = 0 second, voltage of an A.C. generator starts from 0 V and becomes 2 V at time t=1100π second. The voltage keeps on increasing up to 100 V, after which it starts to decrease. Find the frequency of the generator.
EASY
NEET
IMPORTANT

When magnetic flux passing through a coil is changed, the variation of induced current in the coil with time is as shown in graph. If the resistance of coil is 10 Ω , then the total change in flux through the coil will be,

Question Image