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12th Physics weekly Test -2 ( Magnetism and magnetic effects of electric current )

St. Britto Hr. Sec. School - Madurai

12th Physics weekly Test -2 ( Magnetism and magnetic effects of electric current )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The torque experienced by a rectangular current loop placed perpendicular to a uniform magnetic field is

maximum
minimum
finite minimum
zero

The resistance of a conductor is 5Ω at 50⁰C and 6Ω at 100⁰C then the resistance at 0⁰C is ______

0Ω
3.5Ω
4Ω
8Ω

At a given place the horizontal component of earth's field is 0.2 x 10^-4 Tesla. If a vertical wire carries a current of 30A upward, what is the magnitude and direction of the force on 1m of wire?

6 East to West
6 x 10^-2 East to West
6 x 10^-3 East to West
6 x 10^-4 East to West

Angle of dip at a place, wher horizontal and vertical component of earth's fiedl are qual is

45°
60°
30°
0°

If a current carrying conductor is placed in the direction of the magnetic field, then the force on it is ______

BIl
Infinity
-BIl
zero

The angular frequency of a charged particle moving in a uniform magnetic field ______

depends upon the mass and velocity of the particle
depends upon mass and radius of circular path
depends upon the charge and velocity of the particle
neither depends upon the velocity nor the radius of circular path

A thermo-couple is formed by Mn and Hg. The current flows ______

from Mn to Hg at cold junction
from Hg to Mn at cold junction
from Hg to Mn at hot junction
when Mn and Hg are at same temperature

A galvanometer coil has a resistance of 15Ω and gives full scale deflection for a current of 4mA. To convert it to an ammeter of range 0 to 6 amp.

10mΩ resistance is to be connected in parallel to the galvanometer
10mΩ resistance is to be connected in series with the galvanometer
0.1mΩ resistance is to be connected in series with the galvanometer
0.1mΩ resistance is to be connected in. parallel to the galvanometer

Two T.G's having reduction factor K₁ and K₂ are connected series and give deflections θ₁and θ₂ respectively. Then K₁ : K₂

θ₁ : θ₂
tanθ₁ : tanθ₂
θ₂ : θ₁
tanθ₂ : tanθ₁

The unit of magnetic field is

ampere-turn
ampere
newton coulomb
tesla

A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is

1.0 amp – m²
1.2 amp – m²
0.5 amp – m²
0.8 amp – m²

The most suitable metal for permanent magnet is

copper
aluminium
steel
iron

The magnitude and direction of magnetic Lorentz force

\(\vec { F } =\vec { v } \times \vec { B } \)
\(\vec { F } =q/(\vec { v } \times \vec { B } )\)
\(\vec { F } =q(\vec { v } \times \vec { B } )\)
\(\vec { F } =v(\vec { v } \times \vec { B } )\)

Thermopile is used to

measure temperature
measure current
detect thermal radiation
measure pressure

The electrical resistivity of silicon at room temperature is _______

2300 kΩm
2.3 kΩm
0.46 kΩm
0.46 x 10^-3 kΩm

Joule's heating effect and Peltier effect are proportional to the

square and cube respectively of the current
square and the first power, respectively of the current
square of the current
current

Cyclotron is used to

accelerate charged particles or ions to low voltages
decelerate charged particles or ions to high voltages
accelerate charged particles or ions to high energies
accelerate charged particles or ions to high voltages

The resistance of the filament of a 110 W, 220 V electric bulb is,

440 Ω
220 Ω
484 Ω
848 Ω

In which one of the following heating effect to current is undesirable?

electric iron
electric motor
fuse wire
electric bulb

A deutron and an alpha particle move in a magnetic field along the same circular path, then the ratio of their velocities is _______

1:2
2:1
4:1
1:1

Part - B

Generic 5 - Answer All Question

Calculate the magnetic induction at a point on the axial line of a bar magnet.

Deduce and expression for Magnetic dipole moment of revolving electron around the nucleus in a circular orbit.

What difference between soft ferromagnetic materials and hard ferromagnetic materials.

What is Toroid? Calculate the magnetic field at a point
(i) Open space interior to the toroid
(ii) Inside the toroid

Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.

Derive an expression for torque on a current loop placed in a magnetic field

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