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Assertion: A charged capacitor is disconnected from a battery. Now, if its plate are separated, further the potential energy will fall. Reason: Energy stored in a capacitor is not equal to the work done in charging

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Capacitor A device that stores electrical energy in an electric field is known as to be capacitor. It is a passive electronic component with two terminals. It basically consists of two conductors separated by a non-conductive region. This non-conductive region can either be a vacuum or an electrical insulator material known as a dielectric from Coulomb’s law a charge on one conductor will exert a force on the charge carriers within the other conductor, attracting opposite polarity charge and repelling like polarity charges, thus an opposite polarity charge will be induced on the surface of the other conductor. The conductors

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If `2A` current is flowing in the shown circuit, then potential difference `(V_B - V_D)` in balanced condition

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Assertion: Manganin and constantan are widely used in standard resistors. Reason: For manganin and constantan resistance, values would change very little with

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Assertion: The average time of collisions `x` decreases with increasing temperature. Reason: At increased temperature, average speed of the electrons, which act as the carriers of current increases, resulting in more frequent

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Commercial Electrical EnergyAn electrical appliance uses a lot of electric energy when it is operated e.g., geysers heaters etc. The electrical energy consumed is dependent on the time for which a specific appliance of fixed power rating is used. However, the energy used in hour is denoted as `1 kWh=3.6 xx 10^6` joule. This is represented as 1 unit. Different electrical appliance have difference power consumption which is mentioned on the device clearly.Which of the following does not represent electrical

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A proton beam passes without deviation through a region of space. This space has uniform transverse mutually perpendicular electric and magnetic fields with `E=220 kV'/'m and B = 50 mT`. The velocity of the beam

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A current carrying square loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is F, then the net force on the remaining three arms of the loop

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Earth’s Magnetic FieldThe magnetic field lines of the earth resemble that of a hypothetical magnetic dipole located at the centre of the earth. The axis of the dipole is presently tilted by approximately 11.3° with respect to the axis of rotation of the earth.The pole near the geographic north pole of the earth is called the north magnetic pole and the pole near the geographic south pole is called south magnetic pole.The angle of dip at a certain place, where the horizontal and vertical components of the earth’s magnetic field are equal,

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Assertion: Eddy currents are undersirable. Reason: Eddy currents heat up the core and dissipate electrical energy in the form of

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In a circuit containing R and L , as the frequency of the impressed AC increases, the impedance of the

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The core of a transformer is laminated

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When the frequency of an AC circuit is doubled, then the capacitive reactance will b e

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Find the position, nature,and magnification of the image. An object is placed at 10

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Suppose while sitting in a parked car, you notice a jogger approaching towards you in the side view mirror of R = 2 m. If the jogger is running at a speed of 5 m s–1, how fast the image of the jogger appear to move when the jogger is

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If f = 0.5 m for a glass lens, what is the power of the

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A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be

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(i) Fig. shows a cross-section of a ‘light pipe’ made of a glass fibre of refractive index 1.68. The outer covering of the pipe is made of a material of refractive index 1.44. What is the range of the angles of the incident rays with the axis of the pipe for which total reflections inside the pipe take place, as shown in the figure.(ii) What is the answer if there is no outer covering of the

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Explain: In viewing through a magnifying glass, one usually positions one’s eyes very close to the lens. Does angular magnification change if the eye is moved

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A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65. What is the nature of the

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