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Electric Circuits
How many 176 resistors (in parallel) are required to carry 5 A on 220 V line?
Electric Circuits
describe how a single neutral conductor can be made positively charged?
Electric Circuits
A potentiometer wire has length 4 m and resistance 8 ohm . The resistance that must be connected in series with the wire and an accumulator of e.m.f 2 V, so as to get a potential gradient 1 mV per cm on the wire is- A) 44 ohm B) 48 ohm C) 32 ohm D) 40 ohm
Electric Circuits
1.A serial circuit with resistor of 600 ohm and capacity of 4μF is connected to the source of alternating circuit of 100 V with a voltage equation V=Vmsin 250t.The magnitude of inductor that must be serially installed to the circuit in order to flow the current of 100mA is...H
A.0.1
B.0.2
C.0.4
D.0.8
E.1
2.A straight wire of 120 cm carries directional current of 0.25A.If the space is affected by magnetic field of 0.5T that perpendicular to the current,thus the magnitude of Lorentz force of the wire is...
A.0.15N
B.0.30N
C.0.60N
D.30N
E.60N
3.Magnetic flux produced by magnetic filed B that through perpendicularly a surface of width A is P.If the magnetic field is reduced into B/2,but the width surface enlarged to 2A,then flux produced is...
A.P/4
B.P/2
C.P
D.2P
E.4P
A.0.1
B.0.2
C.0.4
D.0.8
E.1
2.A straight wire of 120 cm carries directional current of 0.25A.If the space is affected by magnetic field of 0.5T that perpendicular to the current,thus the magnitude of Lorentz force of the wire is...
A.0.15N
B.0.30N
C.0.60N
D.30N
E.60N
3.Magnetic flux produced by magnetic filed B that through perpendicularly a surface of width A is P.If the magnetic field is reduced into B/2,but the width surface enlarged to 2A,then flux produced is...
A.P/4
B.P/2
C.P
D.2P
E.4P
Electric Circuits
If 1c of charge flows through any cross section of any conductor in 1 second, what is current flowing through the conductor?
Electric Circuits
a voltmeter coil has resistance 50 ohm and a resistor of 1.15k ohm is connected in series . It can read potential difference upto 12volts . If the same coil is used to construct an ammeter which can measure current upto 2A , what should be the resistance of the shunt used?
Electric Circuits
What is the difference between electric potential and potential difference?
I am not able to understand properly. Please help!
I am not able to understand properly. Please help!
Electric Circuits
a 1.5V cell supplies 0.20A to a lamp for 7 hours before the lamp goes out.
what is a sensible estimate for the initial chemical energy content of the cell?
A) 1*10^2J B) 1*10^4J C) 1*10^6J D)1*10^8J
what is a sensible estimate for the initial chemical energy content of the cell?
A) 1*10^2J B) 1*10^4J C) 1*10^6J D)1*10^8J
Electric Circuits
A 3 micro coloumb capacitor is charged to a potential of 300V and 2 micro coloumb capacitor us charged to 200V.The capacitor are then connected in parallel with plates of opposite polarity joined together.What amount of charge will flow,when the plates are so connected?
Electric Circuits
The capacitor plates are fixed on inclined plane p connected to a battery of emf E. A dielectric slab of mass m and dielectric constant k is inserted into the capacitor and tied to mass M using a weightless string as shown. If capacitance have plate area A, length l and distance d between them. Find M such that slab stays in equilibrium. Assume zero friction between slab and plates
