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Electromagnetism
Class 12 · Physics · 5 questions
Name: ____________________ Date: ____________
The force on a charge q moving with velocity v perpendicular to a magnetic field B is:
- A q v B
- B q v / B
- C Zero
- D q B / v
A charged particle moving along the direction of a magnetic field experiences:
- A Maximum force
- B A force opposite to motion
- C A force along the field
- D No force
The magnetic field inside a solenoid depends on:
- A Only its length
- B Only its radius
- C Its colour
- D Turns per unit length and current
Ampere's law relates the line integral of B around a closed loop to the:
- A Flux
- B Current enclosed
- C Mass
- D Charge enclosed
A galvanometer is converted into an ammeter by connecting a:
- A Capacitor in parallel
- B Battery in series
- C Large resistance in series
- D Small resistance in parallel
Answer key
1. A, 2. D, 3. D, 4. B, 5. D
F = q v B sin 90 = q v B.
sin 0 = 0, so there is no force.
B = mu0 n I.
The integral equals mu0 times the enclosed current.
A low resistance shunt in parallel carries most of the current.