EASY
12th CBSE
IMPORTANT
Earn 100

A fan blade of length rotates with frequency cycles per second perpendicular to a magnetic field . Find the p.d. between the centre and the end of the blade.

Important Questions on Electromagnetic Induction
EASY
12th CBSE
IMPORTANT
In a ceiling fan, each blade rotates in a circle of radius . If the fan makes revolutions per second and if the vertical component of earth’s field is , calculate the p.d. developed between the ends of each blade.

EASY
12th CBSE
IMPORTANT
A metal disc of radius is rotated at a constant angular speed of in a plane at right angles to an external field of magnetic induction . Find the emf induced between the centre and a point on the rim.

EASY
12th CBSE
IMPORTANT
A wheel with metallic spokes each long is rotated at in a plane normal to the horizontal component of earth’s magnetic field. The angle of dip at that place is . If the emf induced between rim of the wheel and the axle is , calculate the horizontal component of earth’s magnetic field at the place. How will the induced emf change, if the number of spokes is increased?

EASY
12th CBSE
IMPORTANT
A closely wound rectangular coil of turns and size is rotating in a magnetic field of induction with a frequency of revolution about an axis normal to the field. Calculate the maximum value of induced emf.

EASY
12th CBSE
IMPORTANT
A rectangular coil of dimensions consisting of turns rotates about an axis parallel to its longer side, making revolutions per minute in a field of . What is the maximum emf induced in the coil? Also find the instantaneous emf, when the coil is to the field.

EASY
12th CBSE
IMPORTANT
The armature coil of a generator has turns and its area is . How fast should it be rotated in a magnetic field of , so that the peak value of induced emf is ?

EASY
12th CBSE
IMPORTANT
A circular coil of cross-sectional area and turns is rotated about the vertical diameter with angular speed of in a uniform magnetic field of magnitude . Calculate the maximum value of the current in the coil.

EASY
12th CBSE
IMPORTANT
Calculate the maximum emf induced in a coil of turns and area rotating at the rate of about an axis perpendicular to a uniform magnetic field of . If the resistance of the coil is , what is the maximum power generated by it?
