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
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
A magnetic compass will be deflected if it is kept near a____________________?
(A) charge in motion
(B) charge at rest
(C) both
(D) none
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 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
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 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
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
Heating a magnet will ____________________?
(A) weaken it
(B) strengthen it
(C) reverse its polarity
(D) demagnetize it completely
Galvanometer is a very sensitive device with______________________?
(A) very low damping
(B) very high damping
(C) no damping at all
(D) radial field disintegration