When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?

A. A straight line parallel to the field
B. A parabola in a plane perpendicular to the field
C. A circle in a plane perpendicular to the field
D. A straight line along its initial direction

A wheat stone bridge is said to be balanced when____________________?

A. Maximum current flows through the galvanometer branch
B. Minimum current flows through the galvanometer branch
C. Potential difference across galvanometer branch is maximum
D. Potential difference across galvanometer branch is zero

A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is_________________?

A. Independent mass m
B. Directly proportional to m
C. Directly proportional to q
D. Directly proportional to b

If a current carrying solenoid is suspended freely it will__________________?

A. Be rotating
B. Come to rest in n-s direction
C. Vibrating like galvanometer needle
D. Comes to rest after rotation

A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?

A. F=1/b
B. F=1/bsinθ
C. F/0
D. F=1/bcosθ

When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius___________________?

A. R=qb/mv
B. R=mv/qb
C. R=qmv/b
D. R=qmb/v

A magnetic compass will be deflected if it is kept near a____________________?

A. Charge in motion
B. Charge at rest
C. Both
D. None

If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?

A. Τ = niab cosφ
B. Τ = niab sinφ
C. Τ = niab tanφ
D. Τ = niab

Magnetic flux and flux density are related by___________________?

A. Magnetic flux = flux density / area
B. Magnetic flux = flux density x area
C. Flux density = magnetic flux area
D. Flux density = magnetic flux x area

What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N ?

A. 1a
B. 10a
C. 100a
D. 1000a