EASY
12th CBSE
IMPORTANT
Earn 100

Twelve wires of equal length are connected to form a skeleton cube which moves with a velocity 'v' perpendicular to the magnetic field B. What will be the induced emf in each arm of the cube?

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Important Questions on Electromagnetic Induction

EASY
12th CBSE
IMPORTANT
Two identical loops, one of copper and another of aluminium are rotated with the same speed in the same magnetic field. In which case the induced emf will be more and why?
EASY
12th CBSE
IMPORTANT
Two identical loops, one of copper and another of aluminium are rotated with the same speed in the same magnetic field. In which case the induced current will be more and why?
EASY
12th CBSE
IMPORTANT
A copper coil is taken out of a magnetic field with a fixed velocity. Will it be easy to remove from the same field if its ohmic resistance is increased?
EASY
12th CBSE
IMPORTANT
Name the SI unit of magnetic flux and show that it equals volt-sec. Give three possible ways of producing an induced emf in a coil giving an example in each case.
EASY
12th CBSE
IMPORTANT

A metallic rod of length l and resistance R is rotated with a frequency v, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius l, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere.

Derive the expression for the induced emf and the current in the rod.

EASY
12th CBSE
IMPORTANT

A metallic rod of length l and resistance R is rotated with a frequency v, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius l, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B parallel to the axis is present everywhere.

Due to the presence of the current in the rod and of the magnetic field, find the expression for the magnitude and direction of the force acting on this rod.

EASY
12th CBSE
IMPORTANT

A metallic rod of length l and resistance R is rotated with a frequency v, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius l, about an axis passing through the centre and perpendicular to the plane of the ring. A constant and uniform magnetic field B Parallel to the axis is present everywhere.

Hence, obtain the expression for the power required to rotate the rod.

EASY
12th CBSE
IMPORTANT
A rectangular coil of N turns and area of cross-section A, is held in a time-varying magnetic field given by B=B0sin ωt, with the plane of the coil normal to the magnetic field. Deduce an expression for the emf induced in the coil.