Moving Charges and Magnetism

A square loop, carrying a teady current \(I\), is placed in a horizontal plane near a long straight conductor carrying a steady current \(I\)1 at a distance d from the conductor as shown in figure. The loop will experience

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is the net force on the remaining three arms of the loop is

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency \(f\) Hz. The magnitude of magnetic induction at the center of the ring is

A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

A current loop consists of two identical semicircular parts each of radius R, one lying in the x-y plane and the other in x-z plane. If the current in the loop is \(i\). The resultant magnetic field due to the two semicircular parts at the...

A closely wound solenoid of 2000 turns and area of cross-section 1.5 \(\times\) 10\(-\)4 m2 carries a current of 2.0 A. It is suspended through its centre and perpendicular to its length, allowing it to turn in a horizontal plane in a uni...

A particle having a mass of 10\(-\)2 kg carries a charge of 5 \(\times\) 10\(-\)8 C. The particle is given an initial horizontal velocity of 105 m s\(-\)1 in the presence of electric field \(\overrightarrow E\) and magnetic field $$\over...

A galvanometer havings a coil resistance of 60 \(\Omega\) shows full scale deflection when a current of 1.0 amp passes through it. It can be converted into an ammeter to read currents upto 5.0 amp by

The magnetic force acting on a charged particle of charge \(-\)2 \(\mu\)C in a magnetic frield of 2 T acting in y direction, when the particle velocity is \(\left( {2\widehat i + 3\widehat j} \right) \times {10^6}\,m{s^{ - 1}}\)

Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle

A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction \(\overrightarrow B\). After 3 seconds the kinetic energy of the particle will be

A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RQ are F1, F2 and F3 respectively and are in the plane of the paper and along the directions shown, the force on the ...

A galvanometer of resistance 50 \(\Omega\) is connected to a battery of 3 V along with a resistance of 2950 \(\Omega\) in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection ...

The resistance of an ammeter is 13 \(\Omega\) and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The ...

Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle

Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potential difference in volts should be applied across them so that the magnetic field at their centre...

When a charged particle moving with velocity \(\overrightarrow v\) is subjected to a magnetic field of induction \(\overrightarrow B\), the force on it is non-zero. This implies that

An electron moves in a circular orbit with a uniform speed v. It producess a magnetic field B at the centre of the circle. The radius of the circle is proportional to

A very long straight wire carries a current \(I\). At the instant when a charge +Q at point P has velocity \(\overrightarrow v\), as shown, the force on the charge is

To convert a galvanometer into a voltmeter one should connect a

A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 \(\times\) 10\(-\)4 ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a re...

A long solenoid carrying a current producess a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

A charged particle moves through a magnetic field in a firection perpendicular to it. Then the

To convert a galvanometer into a voltmeter one should connect a

The magnetic field of given length of wire for single turn coil at its centre is B then its value for two turns coil for the same wire is

A charge q moves in a region where electric field and magnetic field both exist, then force on it is

If number of turns, area and current through a coil is given by n, A and \(i\) respectively then its magnetic moment will be

An electron having mass m and kinetic energy E anter in uniform magnetic field B perpendiculaly, then its frequency will be

The magnetic field at centre, P will be