Worksheet -1
Topic : Magnetic effects of current, torque on current loop, magnetic
properties of materials
Q1
1.
Answer the following by choosing the correct option
2.
3.
4.
5.
Which of the following particle can not be accelerated by a cyclotron?
(a) Proton
(b) Alpha particle
(c) Neutron
(d) electron
When a charged particle is projected perpendicular to a uniform magnetic field, it
describes a circular path in which:
(a) Its speed remains constant
(b) Its velocity remains constant
(c) Its momentum remains constant.
(d) Its kinetic energy increases.
Q2
1.
Answer the following in short
2.
3.
4.
5.
6.
Write the expression for Lorentz force in vector form.
State how a moving coil galvanometer can be converted into an ammeter.
7.
8.
9.
10.
If magnetic susceptibility of a certain magnetic material is 0.0001, find its relative
permeability.
In a moving coil galvanometer, what is meant by a radial field?
A coil of radius 10 cm, with 50 turns is placed in a magnetic field of 5 tesla such that the
plane of the coil is parallel to the magnetic field. Calculate the torque acting on the coil.
Mention two factors by which current sensitivity of a moving coil galvanometer can be
increased.
Q2.
Q3.
Q4.
Q5.
Q6.
Q7.
Q8.
A single-turn wire loop is 2.0 cm in diameter and carries a 650mA current. Find the
magnetic field strength (a) at the loop center and (b) on the loop axis, 20 cm from the
center.
Q9.
Q10
A long solenoid of length L having N turns carries a current I. Deduce the expression for
magnetic field along the axis of the solenoid.
A solenoid of length 0.5 m has a radius of 1 cm and is made up of 500 turns. It carries a
current of 5 A. What is the magnitude of magnetic field inside the solenoid?
Q11
Q12
.
Q13
Q14.
Q15.
Derive the expression for force acting per unit length between two parallel infinitely long
straight conductors carrying current I1 and I2 respectively and placed at a distance ‘d’
from each other.
Hence define 1 ampere.
A single piece of wire is bent so that it includes a circular loop of radius a, as shown in
Fig.. A current I flows in the direction shown. Find an expression for the magnetic field at
the center of the loop.
An alpha particle and a proton enter a uniform magnetic field with the same speed in the
perpendicular direction. Compare the radii of their circular paths.