Two point charges q_{2} = 3 x 10^{-6}C and q_{1} = 5 x 10^{-6} C are located at (3 ,5,1,) and (1,3,2) m .

find F12and F_{21} using vector form of coulomb 's law . Also, find their magnitude.

ABC is an equilateral triangle of side 10m and D is the mid point of BC . Charges of +100 , -100 and +75 micro C are placed at B , C and D respectively . Find the force on +1 micro C charge placed at A.

a uniform ladder of length 3.25m and weighing 250N is placed against a smooth vertical wall with its lower end 1.25m from the wall. if coefficient of friction between the ladder and the floor is 0.3 , then , find the frictional force acting on the ladder at the point of contact between ladder and floor.

ans: 52.1N

????

Four charges are placed on corners of a square ABCD, A = Q, B = -2Q, C = +2Q & D = -Q having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be

a) 1.02 x 10^{7} N / C upwards

b) 2.04 x 10^{7} N / C downwards

c) 2.04 x 10^{7} N / C upwards

d) 1.02 x 10^{7} N / C downwards

2 charged metal spheres of radii R and 2R teemporarily placed in contact and then seperated.At the surface of each which sphere has the greater value of tha following:a.charge b.charge density c.potential d.electric field

this problem

Two point charges q

_{2}= 3 x 10^{-6}C and q_{1}= 5 x 10^{-6}C are located at (3 ,5,1,) and (1,3,2) m .find F12and F

_{21}using vector form of coulomb 's law . Also, find their magnitude.^{6 }Nm^{2}/C.No links plsA particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having d = $\frac{3mv}{5qB}atangleof53\xb0$ to the boundry of magnetic field. Find the angle $\theta $ in the diagram

$1.37\xb0\phantom{\rule{0ex}{0ex}}2.60\xb0\phantom{\rule{0ex}{0ex}}3.90\xb0\phantom{\rule{0ex}{0ex}}4.45\xb0$

Q10. A force F is applied along a rod of transverse section area A. The normal stress to a section PQ inclined $\mathrm{\theta}$ to transverse section is

(1) $\frac{\mathrm{F}\mathrm{sin}\mathrm{\theta}}{\mathrm{A}}$ (2) $\frac{\mathrm{F}}{\mathrm{A}}\mathrm{cos\theta}$

(3) $\frac{\mathrm{F}}{2\mathrm{A}}\mathrm{sin}2\mathrm{\theta}$ (4) $\frac{\mathrm{F}}{\mathrm{A}}{\mathrm{cos}}^{2}\mathrm{\theta}$

ABC is an equilateral triangle of side 10m and D is the mid point of BC . Charges of +100 , -100 and +75 micro C are placed at B , C and D respectively . Find the force on +1 micro C charge placed at A.

What will be the value of electric field at the centre of electric dipole?(a)Zero

(b)Equal to the electric field due to one charge at centre

(c)Twice the electric field due to one charge at centre

(d)half the value of electric field due to one charge at centre.

a uniform ladder of length 3.25m and weighing 250N is placed against a smooth vertical wall with its lower end 1.25m from the wall. if coefficient of friction between the ladder and the floor is 0.3 , then , find the frictional force acting on the ladder at the point of contact between ladder and floor.

ans: 52.1N

????

Four charges are placed on corners of a square ABCD, A = Q, B = -2Q, C = +2Q & D = -Q having side of 5cm. If Q is one microcoulomb, then electric field intensity at centre will be

a) 1.02 x 10

^{7}N / C upwardsb) 2.04 x 10

^{7}N / C downwardsc) 2.04 x 10

^{7}N / C upwardsd) 1.02 x 10

^{7}N / C downwards_{x}= 5 A x+ 2 B where E is in NC^{-1 }and x in meter , A and B are constants with dimensions . taking A = 10 N C^{-1}m^{-1}and B = 5 NC^{-1}, calculate (i) the electric flux through the cube (ii) net charge enclosed within the cube2 charged metal spheres of radii R and 2R teemporarily placed in contact and then seperated.At the surface of each which sphere has the greater value of tha following:a.charge b.charge density c.potential d.electric field