Magnetism RT

A proton enters in a magnetic field of B Weber/m² making an angle of 30⁰ with the direction of magnetic field with velocity V. Lorentz force acting on the proton is

•  evB

• zero

• evB/2

A current (I) carrying conductor (length-l) is placed in a magnetic field (B). The maximum force acting on the conductor is

• I B ℓ      

• I B/ℓ     

• I/Bℓ

• B/Iℓ

Tesla = Guass

• 10²

• 10³

• 10⁴

• 10⁶

Two thin long parallel wires separated by a distance b are carrying a current I amp each. The magnitude of the force per unit length exerted by one wire on the other is

The self inductance of a coil is a measure of

• Electrical inertia

• Electrical friction

• Induced e.m.f              

• Induced current

The mutual inductance of a pair of coils is 2H. If the current in one of the coil changes from 10A to zero in 0.1 s, the e.m.f induced in the other coil is

• 2V

• 20V

• 0.2V

• 200V

  If an electron enters the magnetic field at right angle from left and  is into paper, electron will be deflected:1.      

• Upward              

• Downward       

• No deflection

• None of these

If a charge is free to move in an electric field then acceleration produced in it will be:

• a = qEm

The expression for torque acting on a current carrying coil placed in a uniform magnetic field is equal to:

A proton, a deuteron and an -particle accelerated through the same potential difference entre a region uniform magnetic field moving at right angles to B. what is the ratio of their K.E?

• 2 : 1 : 1

• 2 : 2 : 1

• 1 : 2 : 1

• 1 : 1 : 2