Electromagnetic...

To measure the field $$B$$ between the poles of an electromagnet, a small test loop of area $$1$$$$cm^{2}$$, resistance $$10$$$$\Omega $$ and $$20$$ turns is pulled out of it. A galvanometer shows that a total charge of $$2 \mu C $$ passed through the loop. The value of $$B$$ is

An average emf of $$32 V$$ is induced in a coil in which the current drops from $$10 A$$ to $$2 A$$ in $$0.1 s$$. The inductance of the coil is:

A wire moves with a velocity $$v$$ through a magnetic field and experiences an induced charge separation as shown in the figure. Then the direction of the magnetic field is

A train is moving towards north with a speed of $$180$$ kilometers per hour. If the vertical component of the earths magnetic filed is $$0.2 \times 10^{- 4}$$ $$T$$, the emf induced in the axle of length $$1.5$$ $$m$$ is

When rate of change of current in a circuit is unity, the induced emf is equal to

An electric potential difference will be induced between the ends of the conductor shown in the figure, if the conductor moves in the direction shown by :

A coil has $$100$$ turns. When a current of $$5A$$ produces a magnetic flux of $$1\mu Wb$$, the coefficient of self induction is :

The rate of change of current needed to induce an emf of $$8 V$$ in $$0.1 H$$ coil is

Assertion : The induced emf and current will be same in two identical loops of copper and aluminium, when rotated with same speed in the same magnetic field.
Reason : Mutual induction does not depend on the orientation of the coils.

In an inductance coil the current increases from zero to $$6A$$ in $$0.3$$ second by which an induced e.m.f. of $$60V$$ is produced in it. The value of coefficient of self-induction of coil is :