There is a 5Ω resistance in an A.C, circuit. Inductance of 0.1H is connected with it in series. If equation of A.C. e.m.f. is 5sin50t then the phase difference between current and e.m.f. is
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Three resistance R, 2R and 3R are connected in parallel to a battery. Then
A 10 μ F capacitor is charged to a potential difference of 50 V and is connected to another uncharged capacitor in parallel. Now the common potential difference 20 volt. The capacitance of second capacitor is
A stone of mass 1 kg tied to the end of a string of length 1 m, is whirled in a horizontal circle with a uniform angular velocity of 2 rad/s. The tension of the string is (in N)
In an A.C. circuit, maximum value of voltage is 423 volt. Its effective voltage is
Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is
The fact that radiosignals reach the earth from outside the atmosphere, was discovered accidently by
A body of weight 64N is pushed with just enough force to start it moving across a horizontal floor and the same force continues to act afterwards. If the coefficients of static and dynamic friction are 0.6 and 0.4 respectively, the acceleration of the body will be
The value of g on the moon is 1/6th that on earth. A body weighing 60 kg on the earth, has weight on the moon
In an L-R circuit, the value of L is (0.4/π) henry and the value of R is 30 ohm. If in the circuit, an alternating emf of 200 volt at 50 cycles per second is connected, the impedance of the circuit and current will be
Time period of revolution of a satellite around a planet of radius R is T. Period of revolution around another planet, whose radius is 3R but having same density is
In Young's double slit expt., using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461Å) is used, how many fringes will be seen?
The temperature of a gas at pressure P and volume V is 27oC. Keeping its volume constant if its temperature is raised to 927oC, then its pressure will be
On a new scale of temperature (which is linear) and called the W scale the freezing and boiling points of water are 39o W and 239o W respectively. What will be the temperature on the scale, corresponding to a temperature of 39o C on the Celsius scale ?
A length L of a wire carries a steady current I. It is bent first to form circular plane coil of one turn. The same length is now bent more sharply to give a double loop of small radius. The magnetic field at the centre caused by the same current is
A circular coil of radius 2R is carrying current i . The ratio of magnetic field at the centre of the coil and at a point at a distance 6R from the centre of the coil on the axis of the coil is
A charge q moves on a region where electric field and magnetic field both exist, then force is
A certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of 45o. If the current be reduced by a factor of √3, the deflection would
At a certain place, the horizontal component of the earth's magnetic field is B₀, and the angle of dip is 60o. The intensity of earth's magnetic field at that place will be
Earth's magnetic field always has a horizontal component except at
Water level rises in a capilary tube, if the angle of contact is
A horizontal pipe line carries water in a streamline flow. At a point along the pipe where cross-sectional area is 10 cm2, the velocity of water is 1 m-s-1 and pressure is 2000 Pa. The pressure of water, at another point where cross-sectional area is 5 cm2, is (Density of water = 1000 kg-m-3)
A wire can be broken by applying a load of 200 N.The force required to break another wire of the same length and same material, but double in diameter, is
Before jumping in water from above a swimmer bends his body to
A particle starting from rest travels a distance x in first 2 seconds and a distance y in next two seconds, then
In the above problem, if the lift moves up with a constant velocity of 2 m/sec, the reading on the balance will be
The number of neutrons in a chain reaction increases in
4 videos|8 docs|51 tests
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4 videos|8 docs|51 tests
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