"OM Sai Ram"
Q.1. The magnitude of electric
current is increasing from A towards B. If there is any induced current in the
loop as shown in the fig what will be its direction?
Q.2 Which physical quantity is called
the INERTIA OF ELECTRICITY? Why is its called so?
Q.3 Define 1 Henry.
Q.4 Two bar magnets are
quickly moved towards a metallic loop connected across a
capacitor 'C' as shown in the
figure. Predict the polarity of the capacitor.
Q.5 Name and
state the law, which gives the direction of induced e.m.f. in
electromagnetic induction.
Q.6 What are eddy currents ? Write any two applications of eddy
currents.
Q.7 What is the
basic requirement to induce the electric current in a coil ?
Q.8 A current is induced
in coil C1 due to the motion of current carrying coil C2.
(a) Write any two ways by which a large deflection can be
obtained in the
galvanometer G. (b) Suggest an alternative device to demonstrate
the induced current
in place of a galvanometer.
Q.9. In the figure given below, a bar
magnet moving towards the right or left induces an e.m.f. in the coils (1) and
(2). Find giving reason, the directions of the direction of the induced
currents through the resistors AB and CD when the magnet is moving (a) towards
the right, and (b) towards the left.
Q.10 The magnetic
flux linked with a coil varies with time as Ф = 3t2 + 4t + 9 weber.
What is the induced emf at t = 2 ?
Q.11 A circular coil of radius 8 cm and 20 turns rotates about its
vertical diameter with an
angular speed of 50 s-1 in a uniform horizontal
magnetic field of magnitude 3 x 10-2 T. Find the
maximum and average value of the emf induced in the coil.
Q.12 Define self-inductance and give its S. I .
unit. Derive an expression for self- inductance of
a long, air-cored solenoid of length l, radius r, and having N
number of turns.
Q.13 A train is
moving in the North-South direction with a speed of 72 km/hr. Find the amount
of emf generated between two wheels, if the length of axle be 2m. Assume that
the vertical component of earth’s field is 8x10-5wbm-2.
Q.14 What is the
basic principle of Lenz’s Law, explain how it follow law of conservation of
energy.
Q.15 What do you understand
by Inductance and derive the expression for energy stored in an inductor.
Q.16 An a.c. generator consist of a coil
of 50 turns, area 2.5m2 rotating at an angular speed of 60 rad/s in
uniform magnetic field of B = 0.3 T between two fixed pole pieces. Given R =
500 Ώ
(i)
Find the maximum current drawn from the generator?
(ii)
What will be the orientation of the coil wrt. B to have max and zero magnetic
flux?
Q.17 Monica’s mother was heating food
on a gas stove. Her friend Deepti came and saw her mother heating food on the
gas stove. Deepti told Monica’s mother, “Why don’t you buy a microwave oven”?
Monica’s mother replied at once that she doesn’t like to use microwave oven.
Monica and Deepti made it clear that microwave is not harmful for cooking food.
This is an easy and safe process. Monica’s mother got convinced and ordered for
a microwave oven. Monica’s mother then arranged a small party for her friends
and told them the advantages of a microwave oven.
•
What value was displayed by Monica and her friend?
•
What value was displayed by Monica’s mother?
•
What value was displayed by Monica to her friends?
( Value based Question )
Q.18 Derive
expression of mutual inductance of two long coaxial solenoid.
Q.19 What is motional emf. Deduce an
expression for it. State Fleming's right hand rule to find the direction of
induced emf.
Q.20 Describe briefly, with the help of
a labelled diagram, the basic elements of an A.C.
generator.
State its underlying principle. Show diagrammatically how an alternating
emf
is generated by a loop of wire rotating in a magnetic field. Write the
expression
for
the instantaneous value of the emf induced in the rotating loop.
Physics Classes By Er.Shyam Pachori Add: C.L 81 D.D Nagar Mob: 9039803981
Prime Focus on Weak Students Time : MWF 3:30 - 5 pm
No comments:
Post a Comment