the amplitude of simple pendulum is `4times10^(-2)m` .The KE and PE will equal at a distance from the equilibrium position of
(A) `1times10^(-2)m`
(B) `2times10^(-2)m`
(C) `2sqrt(2)times10^(-2)m`
(D) `sqrt(2)times10^(-2)m`

[" 8.The dielectric strength of the air is about "-],[[" (A) "3times10^(6)v/m" (B) "3times10^(4)v/m],[" (C) "3times10^(2)v/m," (D) "3times10^(3)v/m]]

Simplify: 10^(-1)times10^(2)times10^(-3)times10^(4)times10^(-5)times10^(6)

There are 10 turns in coil M and 15 turns in coil N .If a current of 2A is passed through coil M then the flux linked with coil N is 1.8times10^(-3)Wb .If a current of 3A is passed through coil N then flux linked with coil M is : (A) 1.2times10^(-3)Wb (B) 2.7times10^(-3)Wb (C) 1.8times10^(-3)Wb (D) 4.05times10^(-3)Wb

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times x^(2) x 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

6. ^(*) The current in a metal wire of cross-sectional area 10^(-6)m^(2) is 1.6A .If the free electron density of the metal is 8times 10^(28)m^(-3) then the drift speed of electrons is (A) 1.25times10^(-3)ms^(-1) (B) 2times10^(-3)ms^(-1) (C) 1.25times10^(-4)ms^(-1) (D) 2times10^(-4)ms^(-1)

2Litres of an aqueous solution is prepared containing initially 10^(-3) moles of MgCl_(2) and 10^(-3) moles of "NaF" .Find concentration of F^(-) ions in the solution at equlibrium. Given : Ksp [MgF_(2)] = 4times10^(-11) (A) 2times10^(-4)M (B) 4times10^(-4)M (C) 5times10^(-4)M (D) 8times10^(-4)M

Atomic number of aluminium is 13 and its mass numbers is 27. Radius of Aluminium is \(R_{0}=1.4\times10^{-15}m\) (A) \(0.42\times10^{-15}m\) (B)\(42\times10^{-15}\)m (C) \(4.2\times10^{-15}\)m (D)\(4.2\times10^{-10}\)m

28.Four point charges 1 mu C -2 mu C 3 mu C and -2 mu C are arranged on the four vertices of a square of side 1cm .The dipole moment of this charge assembly is 1) zero 2) sqrt(2)times10^(-8)C.m 3) 2sqrt(2)times10^(-8)C m 4) 2times10^(-8)C m