1
MHT CET 2023 14th May Evening Shift
+1
-0

A long solenoid has 1500 turns. When a current of $$3.5 \mathrm{~A}$$ flows through it, the magnetic flux linked with each turn of solenoid is $$2.8 \times 10^{-3}$$ weber. The self-inductance of solenoid is

A
1.2 H
B
2.4 H
C
3.6 H
D
6 H
2
MHT CET 2023 14th May Evening Shift
+1
-0

A coil having effective area A, is held with its plane normal to magnetic field of induction B. The magnetic induction is quickly reduced by $$25 \%$$ of its initial value in 2 second. Then the e.m.f. induced across the coil will be

A
$$\frac{\mathrm{AB}}{4}$$
B
$$\frac{\mathrm{AB}}{2}$$
C
$$\frac{3 \mathrm{AB}}{4}$$
D
$$\frac{3 \mathrm{AB}}{8}$$
3
MHT CET 2023 14th May Evening Shift
+1
-0

The self induction (L) produced by solenoid of length '$$l$$' having '$$\mathrm{N}$$' number of turns and cross sectional area '$$A$$' is given by the formula ($$\phi=$$ magnetic flux, $$\mu_0=$$ permeability of vacuum)

A
$$\mathrm{L}=\mathrm{N} \phi$$
B
$$\mathrm{L}=\mu_0 \mathrm{NAl}$$
C
$$\mathrm{L}=\frac{\mu_0 \mathrm{~N}^2 \mathrm{~A}}{l}$$
D
$$\mathrm{L}=\frac{\mu_0 \mathrm{NA}}{l}$$
4
MHT CET 2023 14th May Morning Shift
+1
-0

The alternating e.m.f. induced in the secondary coil of a transformer is mainly due to

A
varying electric field
B
varying magnetic field
C
the iron core
D
heat produced in the coil
EXAM MAP
Medical
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