Recently Active Electricity And Magnetism Questions

1) A wire of length 1m is moving at aspeed 2m/sec perpendicular to a magnetic field of induction of 0.5T.The ends of wires are formed by a circuit of total resistance 6ohm.What is the rate at which work is done to keep the wi ...

*Image* Magnetic field is inside the plane of paper and increasing with time. Four diiff. shaped conductors PQR are placed as shown. In which figure Potential at point P will be greater than potential at R? ...

A point charge q is placed on one vertex of a cube. What part of the charge is inside the cube? Answer in 1/8th. Why?? ...

1. A loose thread is given a +Q charge. It immediately takes a circular shape. Why? 2. What is the increment in tension caused by placing a charge Qo at the centre of a uniformly charged ring of radius R? The ring has a unifo ...

A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. The potential difference between the surface of the solid sphere and the outer surface of the hollow shel ...

A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. The potential difference between the surface of the solid sphere and the outer surface of the hollow shel ...

The adjoining figure shows tracks of three charge particles 1, 2, and 3 in uniform electric field E Give the Signs of three charges. *Image* ...

COL I 1. Frequency of LC Oscillation 2. Mean Circuit power 3. LCR series 4. LCR resonant series COL II a) Resistive circuit b) Impedance c) I^2 Zcos φ d) 1/2piundrtLC ...

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1. A- Amplitude modeulation can be obtained using a transistor R- There is need of positive feedback to obtain AM. 2. A- (For a prism of refracting angle 60º and refractive index, μ = underroot2 , the Minimum deviation is 3 ...

SINGLE CHOICE 1. A conducting rod is rotated in uniform magnetic force field (B) with constant velocity (V). Thep.d. is developed between ends of rod when a) V||l b) V||B c) l||B d) None 2. Inbinary system 111 represents— ...

3 inf. planes(A,B,C) have uniform surface charge distribution σ on its surface.All charges are fixed.On each of 3 inf. planes,parallel tp YZ plane placed at x=-1,x=0,x=a.Find potential diff b/w A and C ...

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Two charges +q1 and and -q2 are placed at A and B respectively.A line of force emanate from +q1 at an angle α with AB. At what angle it will terminate at -q2? *Image* (a)sin-1[√(q1/q2)sin α/2] (b)2sin-1[√(q1/q2)sin α/2 ...

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1..electric lines of force can never be closed curves 2..electric line of force are path followed by a unit positive charge in an elecric field ...

Statement 1-the electric field inside a conducting shell is 0. Statement 2-no electric line of force can pass through 2 pts having same potential. A)1 is true,2 is true,2 is correct explanation of 1. B)1 is true,2 is true,2 i ...

A charge Q is placed at a distance of r from the center of a neutral solid spherical conductor as shown. Find the potential at B due to induced charges present on surface of solid sphere [A is centre of the sphere] *Image* ...

1) A flat square sheet of charge of side 50 cm carries a uniform surface charge density. An electron 0.5 cm from a point near the centre of the sheet experiences a force of 1.8 X 10 - 12 N, directed away from the sheet. Deter ...

If the potential difference decreases by a factor of n after every ladder then the ratio of R1/R2 is *Image* ...

plz provide me a sert of readings in which u get balanicing length 45cm to 55 cm.....plz it is from cbse practicals............n i need it urgent i have practicals tomorrow..........thanx ...

3 charges 3q,q and Q are placed on straight line with equal separation. in order to make net force on q to be zero.. the value of Q will be???? ...

Column I 1. A fully discharged capaciter battery of constant Emf. is connected to the end of the wire 2. The wire is rotated about one end of its length with constant angular velocity in a uniform magnetic field perpendicular ...

1. Statement-I : The sensitiviry of a moving coil galvanometer is increased by placing a suitable megnetic material as a core in side the will. Statement-II : Soft iron has ligh megnetic permeability and can not be easily meg ...

The threshold frequency for certain metal is 3 × 10^14 Hz. If light of frequency 8.2 × 10^14 Hz is incident on the metal, predict the cut off voltage for photoelectric emission. ...

A straight wire carries a current of 3 A. Calculate the magnifield of the magnitic field at a point 10 emp. away from the wire. ...

State the principle of potantionant. ...

A bridge network ABCD are arranged as follows... resistances b/e terminals A-B, B-C, C-D, D-A and B-D are 10, 20, 15, 5 and 40 ohms respectively. A 20V battery of negligible internal resistance is connected b/w terminals A an ...

A potential diff. of 2 V is applied to a coil of resistance 2 ohm and inductance 2 H. What is the current after 1 second? a) 0.732 A b)0.632 A c)0.932 A d)0.693 A ...