Bucket 1
Bucket 2
Bucket 3
100
Name the type of current
a) used in household supply
b) supplied by an AA cell
a) Alternating current
b) Direct current
100
How does the magnetic field produced by a given electric current in the wire changes as the distance from the wire increases?
Magnetic field's strength decreases as the distance from current-carrying wire increases.
100
________________ law is used to determine the magnetic field at any point due to a current-carrying conductors. (Fill in the blank)
Biot-Savart’s law
200
A vertical wire carrying a current in the upward direction is placed in a horizontal magnetic field directed towards the north. The wire will experience a force directed towards -
a) North
b) South
c) East
d) West
d) West
200
When a charged particle circulates in a normal magnetic field, then the area of its circulation is proportional to -
(a) Its kinetic energy
(b) Its momentum
(c) Its charge
(d) Magnetic fields intensity
(a) Its kinetic energy
200
Name 2 appliances that work on the magnetic effect of current.
Electromagnets.
Maglev trains.
(Any other acceptable answer on teacher's discretion)
300
a) Mention the factors on which the direction of force experienced by a current-carrying conductor placed in a magnetic field depends.
b) Under what condition is the force experienced by a current-carrying conductor placed in a magnetic field maximum?
c) A proton beam is moving along the direction of a magnetic field. What force is acting on the proton beam?
a) Factors -
(i) Direction of current (ii) direction of magnetic field
b) When the direction of current is at right angle to the direction of magnetic field
c) No force is experienced by the proton beam.
300
An infinitely long, straight conductor AB is fixed and a current is passed through it. Another movable straight wire CD of finite length and carrying current is held perpendicular to it and released. Neglect weight of the wire
(a) The rod CD will move upwards parallel to itself
(b) The rod CD will move downward parallel to itself
(c) The rod CD will move upward and turn clockwise at the same time
(d) The rod CD will move upward and turn anti-clockwise at the same time
(c) The rod CD will move upward and turn clockwise at the same time.
Reason: Since the force on the rod CD is non-uniform it will experience force and torque.
From the left-hand side, it can be seen that the force will be upward and torque is clockwise.
300
A conducting loop carrying a current i is placed in a uniform magnetic field pointing into the plane as shown. The loop will have a tendency to
(a) Contract
(b) Expand
(c) Move towards + ve x-axis
(d) Move towards – ve x-axis
The net force on a current-carrying loop in a uniform magnetic field is zero. Hence the loop can't translate. So, options (c) and (d) are wrong.
From Flemings left-hand rule we can see that if the magnetic field is perpendicular to paper inwards and current in the loop is clockwise (as shown) the magnetic force Fm on each element of the loop is radially outwards, or the loops will have a tendency to expand.