At the moment of moving the magnet in either of the two direction ( 1 ) and ( 2 ) with the same speed, e.m.f of 0.5 V B is induced in the coil . Which of the following choices is correct at the moment of moving the magnet?

The brightness of the lamp increases on moving the magnet in the direction (1)

The brightness of the lamp vanishes momentarily on moving the magnet in the direction (2)

The brightness of the lamp increases on moving the magnet in the direction (2)

The brightness of the lamp remains constant on moving the magnet in both directions (1) or (2)

The figure illustrates a magnet moving with velocity ( v ) to the left towards a solenoid connected to a galvanometer . But there is no current induced in the coil, this is due to that the solenoid moves ...............?

With velocity ( v ) to the left

With velocity ( 2v ) to the left

With velocity ( v ) to the right

With velocity ( 2v ) to the right

You have DC electric motor consists of a single coil that started its motion from a position parallel to the flux lines as in the figure, after the coil rotates by 60° clockwise from the shown position, therefore ...............?

the force on the side (ab) remains constant

the force on side (bc) = half its maximum value

the torque = $$\frac{\sqrt[]{3}}{2}$$ from the maximum value

In the opposite figure, an inductive coil of negligible ohmic resistance if $$\frac{1}{4}$$ of the coil is cut and the rest of the coil is connected to the circuit without changing any other factors , the correct choice is .................?

The phase angle decreases by 8.13°

The phase angle decreases by 36.87°

The phase angle decreases by 30.96°

The phase angle decreases by 14.04°

The figure illustrates, a straight current-carrying wire. Which of the following choices represents correctly the relation between the magnetic flux densities ( B Y and B z ) due to the current ( I ) in the wire at points ( Y ) and ( Z ) that lie in the same vertical plane with the wire?

B z < B y and in the same direction

B Z = B Y and in the opposite direction

B Z = B Y and in the same direction

B z < B Y and in the opposite direction

One of the military applications of laser is for destroying missiles, this is due to ................ ?

The coherency of laser beam photons

The monochromaticity of laser beam

The emergence of laser beam from the semi -transparent mirror in He-Ne laser starts depending on .............. ?

The intensity of the radiation inside the resonance cavity

achieving the state of population inversion with a definite ratio for the atoms of the active medium

The electric potential difference inside the laser tube

The lifetime of the metastable level

The amplification of the number of photons produced by stimulated emission in He-Ne laser is due to the collisions of .................?

The reflected photons in the resonance cavity with the excited neon atoms in the metastable level

The excited neon atoms in the metastable level with each other

The excited neon atoms in the metastable level with the excited helium atoms

The excited helium atoms with the unexcited neon atoms

The electric circuit shown in the figure represents a transistor used as a switch, so on increasing the value of R B to double its value. Which of the following choices correctly describes what happens to the value of V cc ?

It increases to double its value

The value of intensity of the electric field established inside the diode at a certain temperature becomes constant when .............?

The diffusion current equals the drift current

The whole holes transfer from the p-region to the n-region

The whole free electrons transfer from the n-region to the p-region

Both regions of the diode become electrically neutral

Two identical magnets (1) , (2) were placed at the same distance from a solenoid as shown in the figure. One moving each of the magnets with the same speed simultaneously towards the two terminals of the solenoid and along its axis, it is noticed that the pointer of the galvanometer doesn't deflect. This is due to ...............?

Pole (A) is north and pole (D) is north

Pole (A) is north while pole (D) is south

Pole (A) is south while pole (D) is north

Pole (B) is south and pole (D) is south

A straight wire of length $$\left(\iota\right)$$ moves with velocity ( v ) inclined to a magnetic field of flux density ( B ) with an angle ( 30° ) to the direction of the field, so an induced electromotive force is generated in it . To increase the electromotive force generated in it to the double............?

The wire must move perpendicular to the magnetic field

The length of the wire must increased to

The wire must move with velocity

The wire must move in a magnetic field of flux density= (1/2 B)

A single coil DC electric motor, when the coil's plane is perpendicular to the magnetic flux lines, which of the following quantities does not equal zero ?

Magnetic dipole moment for the coil

The magnetic force affecting the coil's sides

In the figure the wire ( L ) is able to move in the same plane of the page through a magnetic field perpendicular into the page. Which of the following choices is correct ?

If the wire is moved towards point "A" the potential of the point "C" will be greater than that of "D"

If the wire is moved towards point "A" the potential of the point "C" will be less than that of "D"

If the wire is moved towards point "B" the potential of the point "C" will be greater than that of "D"

If the wire is moved towards point "B" the potential of the point "C" will be equal to that of "D"

3rd year final

Authored by Esraa Radwan

Physics

12th Grade

Used 3+ times

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88 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which graph represents the correct relation between the electric potential difference (V) across the two terminals of the fixed resistance (R) and the ammeter reading (I) at the same temperature ?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The figure illustrates a closed electric circuit when the switch (K) is opened so ................?

The ammeter reading decreases , while the voltmeter reading increases

The ammeter reading increases, while the voltmeter reading decreases

The reading of both ammeter and voltmeter decreases

The reading of both ammeter and voltmeter increases

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The figure represents a part from a closed electric circuit. The equivalent resistance of the shown combination equals ..................?

2 R

R/2

3 R/5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The figure represents lwo straight current carrying parallel wires (A) and (C) which of the following choices represents the intensity and the direction of the current in wire (C) that produces a neutral point at point (Z) ?

2 A , in the same direction of the current in wire (A)

0.5 A , in the same direction of the current in wire (A)

0.5 A , in opposite direction of the current in wire (A)

2 A , in opposite direction of the current in wire (A)

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The graph represents the relation between the magnetic flux density (B) at the mid-point of the axis of a number of spiral coils (L,M,N and O) and the current intensity (I) passing through them, if you know that all the coils have the same number of turns and their cores have the same magnetic permeability, then the coil that has the smallest length is coil .................?

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Using the illustrated in both figures (1) and (2) . Which of the following relations represent correctly the relation between magnetic flux density (B) at points C₁ and C₂ ?

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Which graph represents the correct relation between the electric potential difference (V) across the two terminals of the fixed resistance (R) and the ammeter reading (I) at the same temperature ?

The figure illustrates a closed electric circuit when the switch (K) is opened so ................?

The figure represents a part from a closed electric circuit. The equivalent resistance of the shown combination equals ..................?

The figure represents lwo straight current carrying parallel wires (A) and (C) which of the following choices represents the intensity and the direction of the current in wire (C) that produces a neutral point at point (Z) ?

Using the illustrated in both figures (1) and (2) . Which of the following relations represent correctly the relation between magnetic flux density (B) at points C1 and C2 ?

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Using the illustrated in both figures (1) and (2) . Which of the following relations represent correctly the relation between magnetic flux density (B) at points C₁ and C₂ ?