The length of a sonometer wire is 0.75m and density `9xx10^3 kgm^(-3)`. It can bear astress of `8.1xx10^8 Nm^(-2)` without exceeding the elastic limit Calculate the fundamental frequency that can be produced in the wire.

A metal wire of linear mass density of 9.8 gm^-1 is stretched with a tension of 10kg wt between two rigid supports of 1 metre apart. If the wire is allowed to vibrate in its fundamental frequency, then find the frequency of vibration.

A tuning fork has got a frequency equal to the fundamental frequency of 25 cm length of a sonometer wire.Without change the load,if the legth of the wire is increased to 25.5 cm then 3 beats are heard per secondwhen the fork and wire are made to vibrate together.Calculate frequency of the tuning fork.

Can a body have a charge of 1.8xx10^(-19) C? Give reason.

A galvanometer having a resistance of 50Ω gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross section 3×10^−3 cm^2 that can be used to convert the galvanometer into an ammeter which can read a maximum of 5A current is [specific resistance of the wire =5×10^−7 Ωm]

In Millikan’s oil drop experiment, what is the terminal speed of an uncharged drop of radius 2.0 xx 10^-5m and density 1.2 xx 10^3 kg m^-3 ? Take the viscosity of air at the temperature of the experiment to be 1.8 xx 10^-5 Pa s. How much is the viscous force on the drop at that speed? Neglect buoyancy of the drop due to air.

An electric dipole of length 2cm is placed with its axis at an angle of 60° to a uniform electric field of 10^5 NC^-1 . If it experiences a torque of 8sqrt3 Nm . Calculate Potential energy of the dipole.

A steel wire 0.72m long has amss of 5.0 xx 10^3 kg . If the wire is under the tension of 60N, what is the speed of transverse wavs on the wire?

A copper wire has diameter 0.5 mm and resistivity of 1.6 xx 10^-8Omega m. What will be the length of this wire to make its resistance 10Omega ? How much does the resistance change if the diameter is doubled?