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Read the assertion and reason carefully to mark the correct option out of the options given below. Assertion : Two short magnets are placed on a cork which floats on water. The magnets are placed such that the axis of one produced bisects the axis of other at right angles. Then the cork has neither translational nor rotational motion. Reason : Net force on the cork is zero.

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Explanation

When two short magnets are placed on a cork such that their axes are perpendicular, the magnetic forces balance each other out, resulting in no net force or torque acting on the cork. This means the cork will have neither translational nor rotational motion. Therefore, both the assertion and reason are true, and the reason correctly explains the assertion.

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Read the assertion and reason carefully to mark the correct option out of the options given below. Assertion : Cyclotron is a device which is used to accelerate the positive ion. Reason : Cyclotron frequency depends upon the velocity.

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Explanation

The assertion is correct that a cyclotron is a device used to accelerate positive ions. However, the reason is false because the cyclotron frequency depends on the magnetic field and the charge-to-mass ratio of the particle, not its velocity.

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Read the assertion and reason carefully to mark the correct option out of the options given below. Assertion : The magnetic field produced by a current carrying solenoid is independent of its length and cross-sectional area Reason : The magnetic field inside the solenoid is uniform.

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Explanation

Both the assertion and reason are true. A current-carrying solenoid produces a magnetic field that is uniform and independent of its length and cross-sectional area. However, the reason does not explain why the magnetic field is independent of these factors.

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Advanced countries are making use of powerful electro magnets to move trains at very high speed. These trains are called maglev trains. These trains float on a guideway and do not run on steel tail trucks. Instead of using an engine based on fossil fuels, they make use of magnetic field forces. The magnetized coil are arranged in the guideway which repel the strong magnets placed in the train's under carriage. This helps train move over the guideway, a technique called electrodynamics suspension. When current passes in the coils guideway, a typical magnetic field is set up between the under carriage of train and guideway which pushes and pulls the train along the guideway depending on the requirement. The lack of friction and its aerodynamic style allows the train to move at very high speed. The force which makes manglev move is

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Explanation

The force that makes maglev trains move is magnetic. The magnetic coils in the guideway set up a magnetic field that interacts with the strong magnets in the train's undercarriage, allowing it to float and move along the guideway with minimal friction.

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Advanced countries are making use of powerful electro magnets to move trains at very high speed. These trains are called maglev trains. These trains float on a guideway and do not run on steel tail trucks. Instead of using an engine based on fossil fuels, they make use of magnetic field forces. The magnetized coil are arranged in the guideway which repel the strong magnets placed in the train's under carriage. This helps train move over the guideway, a technique called electrodynamics suspension. When current passes in the coils guideway, a typical magnetic field is set up between the under carriage of train and guideway which pushes and pulls the train along the guideway depending on the requirement. The lack of friction and its aerodynamic style allows the train to move at very high speed. The disadvantage of magtev train is

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Explanation

Maglev trains use advanced electromagnetic technology to achieve high speeds and reduced friction. However, the primary disadvantage is their high initial cost due to the expensive infrastructure and technological requirements necessary for their operation.

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In each of the following questions, Match column-I and column-II and select the correct match out of the four given choices Column - I (A) Biot-savart's law (B) Right handthumb rule (C) Fleming's left hand rule (D) Fleming's right and rule Column - II (P) Direction of magnetic field induction (Q) Magnitude of magnetic field induction (R) Direction of induced current (S) Direction of force due to a mag. field.

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Explanation

Biot-Savart's law is used to determine the magnitude of magnetic field induction (A -> Q). The Right Hand Thumb Rule is used to determine the direction of the magnetic field induction (B -> P). Fleming's Left Hand Rule is used to determine the direction of force due to a magnetic field (C -> S). Fleming's Right Hand Rule is used to determine the direction of induced current (D -> R).

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In each of the following questions, Match column-I and column-II and select the correct match out of the four given choices Column - I (A) Moving coil Galvanometer (B) Ammeter (C) Voltmeter (D) Avometer Column - II (P) Low resistance (Q) Moderate resistance (R) High, Low or moderate resistance (S) High resistance

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The velocity of light is maximum in a medium of

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Explanation

The velocity of light is maximum in a vacuum. In a vacuum, light travels at its highest speed, which is approximately $3 imes 10^8 ext{ m/s}$. In other mediums like diamond, water, and glass, light slows down due to the higher refractive index.

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"Bhautik" runs towards a plane mirror with a speed of $20 ms^{–1} $, what is the speed of his image ?

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Explanation

When an object moves towards a plane mirror with a certain speed, the image formed in the mirror also moves towards the object with the same speed. Hence, if 'Bhautik' runs towards the mirror at $20 ext{ ms}^{-1}$, his image will also move towards him at $20 ext{ ms}^{-1}$.

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A ray of light is incident at an angle $ 30^\circ $ on a mirror, The angle between normal and reflected ray is ............

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Explanation

According to the law of reflection, the angle of incidence is equal to the angle of reflection. Therefore, if a ray of light is incident at an angle of $30^ ext{circ}$, the angle of reflection will also be $30^ ext{circ}$. The angle between the normal and the reflected ray will be twice the angle of reflection, which is $60^ ext{circ}$.

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