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Moving Coil Galvanometer
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Q.1
Voltage can be induced in a wire by
a. moving the wire near a magnet.
b. moving a magnet near the wire.
c. changing the current in a nearby wire.
d. all of these
Q.2
Current sensitivity of a galvanometer can be increased by decreasing :
Magnetic field B
number of turns N
torsional constant K
Area A
Q.3
___ Law says that the Induced current is proportional to the change of magnetic flux
Lenz'
Faraday's
Ampere's
Q.4
A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage
quadruples
doubles
is the same
halves
Q.5
The ratio of voltage sensitivity ( V_sVs ) and current sensitivity ( IsI_sIs ) of a moving coil galvanometer is (G =conductance)
1G\frac{1}{G}G1
1G2\frac{1}{G^2}G21
GGG
G2G^2G2
Q.6
Electromagnetic induction is change in ___________________.
surface area
magnetic poles
magnetic flux
Q.7
What benefit is gained by the addition of the iron core in an electromagnet?
It makes a strong magnet weaker
It makes a weak magnet stronger
There is no benefit at all
It lets currents interact with each other
Q.8
What is one way to increase the current in a wire?
Decrease the number of coils
Increase the number of coils
Move the magnet slower
Take the wire off of the magnet
Q.9
Which description best applies to Lenz's Law?
An induced current occurs when a magnet passes through a tube.
When a change in magnetic field occurs to a coil the direction of current goes in the in the other direction to this change.
The direction of an induced current is such to align with the change that created it.
A magnet is a tube is always slowed by its magnetic field.
Q.10
A magnet can move in a coil of wire to produce electricity in which system?
Generator
Motor
Magnet
Transformer
Q.11
What would happen if I move a bar magnet in and out of a coil of copper wire?
Electric current would disappear
The magnet would explode
Electric current will flow through the wire
It would produce a gravitational field
Q.12
A linear conductor carrying current if placed parallel to the direction of magnetic field, then it experiences ---------------- force.
Maximum
Zero
normal
None of these
Q.13
A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
B
2B
4B
8B
Q.14
To convert a moving coil galvanometer into on ammeter of given range, we must connect:
A suitable low resistance in series
A suitable low resistance in parallel
A suitable high resistance in parallel
A suitable high resistance in series
Q.15
Two wires of same length are shaped into a square and a circle if they carry same current, ratio of magnetic moment is :
2 : pi
pi: 2
pi: 4
4:pi
Q.16
An electric current passes through a long straight copper wire. At a distance 5 cm from the straight wire, the magnetic field is B. The magnetic field atcm from the straight wire would be
B/6
B/4
B/3
B/2
Q.17
Currents ofA and 2 A are flowing in opposite directions through two parallel wires A and B respectively. If the wire A is infinitely long and wire B is 2 m long, then force on wire B which is situated atcm from A, is
8 x 10 ^ -5 N
6 x 10 ^-5 N
4 x 10 ^ -5 N
2 X 10 ^ -5 N
Q.18
A deuteron of kinetic energykeV is describing a circular orbits of radius 0.5 m in a plane perpendicular to the magnetic field B. The kinetic energy of the proton that describes a circular orbit of same radius and inside same B is
25 keV
50 keV
200 keV
100 keV
Q.19
In a certain region of space, electric field E and magnetic field B are perpendicular to each other. An electron enters perpendicularly to both the fields and moves undeflected. The velocity of electron is
E/B
B/E
E x B
E.B
Q.20
What type of device can increase and decrease voltage?
Generators
Transformers
Galvanometers
Electric motors
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