A piece of straight wire has mass 20g and length lm. It is to be levitated using a current of 1A flowing through. A perpendicular magnetic field B in a horizontal direction is applied what must be the magnetic field B? take `g = 9.8 m//s^2`

A rod of length l is rotated about its one end, perpendicular to a magnetic field of induction B What is the e.m.f induced in the rod

A uniform conducting wire ABC has a mass of 10 g. A current of 2A flows through it. The wire is kept in a uniform magnetic field B= 2T. The acceleration of the wire will be

A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in a uniform magnetic field of induction 2 tesla. If the magnetic field is perpendicular to the length of the wire , the force acting on the wire is

A conductor of length lm and carrying current of 1A is placed at an angle of 45^@ to the magnetic field of 1G. The force acting on the conductor is

A straight wire of length 0.5 m carrying a current of 1.6 ampere is placed in a uniform magnetic field of induction 2 T. If the magnetic field is perendicular to the length of the wire, then force on the wire is

Radiation of wavelength 4500overset@ A is incident on a metal having work function 2.0 eV. Due to the presence of a magnetic field B, the most energetic photoelectrons emitted in a direction perpendicular to the field move along a circular path of radius 20 cm. What is the value of the magnetic field B?

Radiation of wavelength 4500 overset (@)(A) is incident on a metal having work function 2.0 eV. Due to the presence of a magnetic field B,the most energetic photoelectrons emitted in a direction perpendicular to the field move along a circular path of radius 20 cm. What is the value of the magnetic field B?

Consider a square loop of wire loaded with a glass bulb of mass m hanging vertically, suspended in air with its one part in a uniform magnetic field B with its direction coming out of the plane of paper. Due to the current I flowing through the loop, there is a magnetic force in upward direction calculate the current I in the loop for which the magnetic force would be exactly balanced by the force on mass m due to gravity.