Physics Mcqs

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

• (A)  charge in motion
• (B)  charge at rest
• (C)  both
• (D)  none

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

Heating a magnet will ____________________?

• (A)  weaken it
• (B)  strengthen it
• (C)  reverse its polarity
• (D)  demagnetize it completely

Answer

Submitted By :Ali Uppal

Galvanometer is a very sensitive device with______________________?

• (A)  very low damping
• (B)  very high damping
• (C)  no damping at all
• (D)  radial field disintegration

Answer

Submitted By :Ali Uppal