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In the previous problem, if 15.0 cm of water and spirit each are further poured into the respective arms of the tube, what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury =

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A tunnel is dug through the centre of the Earth. Show that a body of mass ‘m’ when dropped from rest from one end of the tunnel will execute simple harmonic

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Explain why the reactance provided by a capacitor to an alternating current decreases with increasing

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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1MW power is to be delivered from a power station to a town 10 km away. One uses a pair of Cu wires of radius 0.5 cm for this purpose. Calculate the fraction of ohmic losses to power transmitted if power is transmitted at 220V. Comment on the feasibility

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An ideal transformer has 1:25 turn ratio. The peak value of the ac is 28 V. The rms ms secondary voltage is nearest

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A step down transformer is connected to main supply 200 V to operate a 6V, 30 w bulb. The current in primary

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In an ac circuit, the current is given by `I= 5sin[ 100 t -pi/2]` and the ac potential is `V = 200 sin 100t`. Then the power consumption

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A lamp consumes only 50% of peak power in an ac circuit. What is the phase difference between the applied voltage and the circuit

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A 20 volts ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In a series resonant LCR circuit, the voltage across R is 100 V and `R= 1kOmega` with `C =2muF`. The resonant frequency `omega` is 200 rad/s.At resonance the voltage across L

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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An LC circuit contains a 20mH inductor and a `50muF` capacitor with an initial charge of 10mC. The resistance of the circuit is negligible. Let the instant the circuit is closed to be `t = 0.`What is the total energy stored

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Answer the following questions: A charged particle enters an environment of a strong and non-uniform magnetic field varying from point to point both in magnitude and direction, and comes out of it following a complicated trajectory. Would its final speed equal the initial speed if it suffered no collisions

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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The diagrams given in Fig. show magnetic field lines (thick lines in the figure) wrongly. Point out what is wrong with them.

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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In the magnetic meridian of a certain place, the horizontal component of the earth’s magnetic field is 0.26G and the dip angle is 60°. What is the magnetic field of the earth at this

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Would the maximum possible magnetisation of a paramagnetic sample be of the same order of magnitude as the magnetisation of a

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A long solenoid has 1000 turns per metre and carries a current of 1 A. It has a soft iron core of μr = 1000. The core is heated beyond the Curie temperature,

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Use (a) the Ampere’s law for H and (b) continuity of lines of B, to conclude that inside a bar magnet, lines of B must run from the S pole to N

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Assume the dipole model for earth’s magnetic field B which is given by BV = vertical component of magnetic field = `μ_0 /(4π) (2mcosθ )/r^3 ` BH = Horizontal component of magnetic field = `μ_0 /(4π) (sinθm)/r^3 ` θ = 90° – lattitude as measured from magnetic equator. Find loci of points for which

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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Consider a wire carrying a steady current, I placed in a uniform magnetic field B perpendicular to its length. Consider the charges inside the wire. It is known that magnetic forces do no work. This implies

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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A charged particle would continue to move with a constant velocityin a region

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

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