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12th Physics Monthly Test - 1 ( Magnetism and magnetic effects of electric current )

St. Britto Hr. Sec. School - Madurai

12th Physics Monthly Test - 1 ( Magnetism and magnetic effects of electric current )-Aug 2020

Time : 2.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Parts of the energy is used in an electric motor and the remaining part of the energy is dissipated in form of

current in the resistors
heat in the resistor
voltage in the resistors
resistance in the resistor

A moving coil galvanometershows a deflection of 12⁰, when a current of 1mA flows through it. If the current is 2 mA, then the deflection will be _____

10°
12°
14°
24°

2 ampere and 3 ampere currents are passed through the heating element of an electrical Iron box. The ratio of quantity of heats evolved is ______.

2:2
3:2
4:9
9:4

Bohr magneton is given by the formula

\(\frac { neh }{ 4\pi m } \)
\(\frac { meh }{ 4\pi } \)
\(\frac { 4\pi m }{ en } \)
\(\frac { 4\pi e }{ mh } \)

The resistance of an ideal ammeter is _______

large
infinite
zero
small

At the junction of an electric circuit the accumulation of charges is _______

positive maximum
negative maximum
zero
moderate

The magnetic induction at the center of a circular coil carrying current is

\(\frac { \mu nI }{ 2a } \)
\(\frac { \mu I }{ 2\pi a } \)
\(\frac { \mu I }{ 2na } \)
\(\frac { \mu I }{ 2na } \)

The vertical component of Earth’s magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place?

30°
45°
60°
90°

In a T.G. experiment, for two different values of current, the deflections are 45° and 30° respectively, then the ratio of the current is

2 : 3
3 : 2
\(\sqrt{3}\) : 1
1 : \(\sqrt{3}\)

Which of the following produces large Joule heating effect

IA current through 2Ω resistor for 3 seconds
IA current through 3Ω resistor for 2 seconds
2A current through 1Ω resistor for 2 seconds
3A current through 1Ω resistor for 1 second

The unit of reduction factor of tangent galvanometer is _______

no unit
tesla
ampere
ampere/degree

Fuse wire is an alloy of

lead and tin
tin and copper
lead and copper
lead and iron

The minimum value of orbital magnetic moment of revolving electron in an atom is called

Angular momentum
Bohr magneton
Gyromagnetic ratio
Planck's constant

Thermopile is used to

measure temperature
measure current
detect thermal radiation
measure pressure

A 110 W, 220 V bulb draws a current

2 A
440 A
0.5 A
5.5 A

These are behaving like thermistor

insulators and conductors
semiconductors and conductors
insulators and semiconductors
conductors and alloys

Part - B

Generic 2 - Answer All Question

What is Cyclotron? State the principle of Cyclotron.

What is magnetic Lorentz force?

State Ampere’s circuital law.

At a place, the horizontal component of earth's magnetic field is B and angle of dip is 60°. What is the value of horizontal component of the earth's magnetic field at equator?

Where on the earth's surface is the value of
(i) angle of dip maximum
(ii) vertical component of earth's magnetic field zero

Write the Similarities between Coulomb's law and Biot-Savort's law.

What are the causes for earth's magnetic field according to Gover?

What is meant by horizontal component of Earth's magnetic field.

What are the properties required to make Permanent magnets?

Define ampere.

What is Declination?

What do you mean by coercivity?

Tabulate End rule polarity with direction of current in circular loop using module.

State the elements of Earth's magnetic field.

The magnetic field lines prefer to pass through iron tnanaii why?

What is meant by
(i) Geographic axis
(ii) Geographic meridian &
(iii) Geographic equator

State Right hand thumb rule.

Part - C

Generic 3 - Answer All Question

State that a current carrying loop behaves as a magnetic dipole. Hence write an expression for its magnetic dipole moment.

Find the magnetic induction due to a long straight conductor using Ampere’s circuital law.

What is tangent law? Discuss in detail.

Magnetic field lines can be entirely confined within the core of a toroid, but not within a straight solenoid. Why?

Write the Properties of magnet.

Two identical charged protrudes moving with the same speed enter a region of uniform magnetic field. If one of these enters normal to the field direction and the other enters along a direction at 30° with the field. What would be the ratio of their angular frequencies.

Calculate the magnetic field inside and outside of the long solenoid using Ampere’s circuital law.

Explain the principle and working of a moving coil galvanometer.

State the rule which is used to find the direction of field acting at a point near a current carrying street conductors?

Discuss Earth’s magnetic field in detail.

Obtain a relation for the magnetic induction at a point along the axis of a circular coil carrying current.

A rectangular current carrying loop placed 2cm away from a long, street, current - carrying conductors. What is the direction and magnitude of the net force acting on the loop.

Part - D

Generic 5 - Answer All Question

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

An electron in a hydrogen atom is moving with a speed of 2.3 x 10⁶ ms^-1 in an orbit of radius 0.53 Å. Calculate the magnetic moment of the revoling electron.

A circular coil of 120 turns has a radius of 18cm and carries a current of 3A. What is the magnitude of the magnetic field at a point on the axis of the coil at a distance from the centre equal to the radius of the circular coil.

Calculate the magnetic field at the center of a square loop which carries a current of 1.5 A, length of each loop is 50 cm.

Calculate the torque of a 100 turns rectangular coil of length 40 cm and breadth 20 cm, carrying a current of 10A, when placed making an angle of 60° with a magnetic field of 57.

A cyclotron's frequency is 8μHz. What should be the operating magnetic field for accelerating protons? If the radius of its dees is 50cm. calculate the k.E (is μeV) of the proton beam produced by the accelerator.

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