List of top Questions asked in AP EAPCET- 2023

Distance moved by a charged particle in magnetic field (with parallel velocity component) in one rotation is:
Curl the palm of your right hand around the circular wire with the fingers pointing in the direction of current and the thumb gives the direction of the magnetic field. In this case the upper side of the loop may be thought of as:
A magnetic field intensity at the centre of a circular wire of radius 0.1 m carrying a current 0.2 A is:
A solenoid has a core of a material with relative permeability 400. The windings of the solenoid are insulated from the core and carry a current of 4 A. If the number of turns is 500 per metre, then the magnetizing field is:
The Lenz law is associated with
Core of electromagnets are made of materials which have the properties
A charged particle when enters a uniform magnetic field moves in a helical path. If its angular velocity is \( 4\pi \times 10^6 \) rad s\(^{-1} \) and its velocity in the direction of magnetic field is \( 3 \times 10^5 \) ms\(^{-1} \) then the pitch of the helix is
In some ferromagnetic materials magnetization disappears on the removal of the external magnetic field. Such materials are called
A circular coil of 30 turns and radius 8 cm carrying a current of 6 A is suspended vertically in a uniform horizontal magnetic field of magnitude 1.0 T. The field lines make an angle of 30° with the normal of the coil. The magnitude of the counter torque that must be applied to prevent the coil from turning is
The Curie temperature \( T_c \) represents:
A wire is first bent in the form of a circular coil of 5 turns and the same wire is then bent in the form of another circular coil of 10 turns. If same current is passed in both the coils, then the ratio of the magnetic fields at their centres is
One of the following substances having the tendency to move from stronger region to the weaker region of the magnetic field is:
For parallel conductors and steady currents, the results in accordan with Newton's third law are
Consider a tightly wound 100 turn coil of radius 10 cm carrying a current of 2A. The magnitude of the magnetic field at the ntre of the coil is
If B is magnetic field and q is the charge then the following represents the Gauss's law of magnetism
The magnetic field lines of a bar magnet
Among the following, the quantity that is termed as gyro magnetic ratio is (Given: $m_e$ = mass of electron, $e$ = charge of electron)
A cyclotron’s oscillator frequency is 20 MHz. The operating magnetic field for accelerating protons is
(Charge of proton = \( 1.6 \times 10^{-19} \) C, mass of proton = \( 1.67 \times 10^{-27} \) kg)
The force acting per unit length when a very long straight conductor is carrying a steady current of 1 A and the direction of the current is from south to north is (The horizontal component of the earth's magnetic field at the place is \( 3 \times 10^{-5} \) T and the direction of the field is from the geographical south to geographical north.)
The axial field \( B_A \) and equatorial field \( B_E \) due to a short bar magnet at equal distances are related as:
The magnitude of the axial field due to a short bar magnet at a distance of 50 cm from its mid-point is
If \( q \) is electric charge, \( B \) is magnetic field, \( R \) is the dee radius and \( m \) is the mass of ions, the kinetic energy of the ions in cyclotron is given by:
In an ac generator, if a coil of \( N \) turns and area \( A \) is rotated at \( \nu \) revolutions per second in a uniform magnetic field \( B \), then the motional emf produced is equal to \[ (t = 0 s, the coil is perpendicular to the field) \]
The figure shows three points A, B and C in a uniform electric field \( (\vec{E}) \). The line AB is perpendicular to BC and BC is parallel to \( \vec{E} \). If \( V_A \), \( V_B \) and \( V_C \) are the potentials at A, B and C respectively, then the correct option is
three points A, B and C in a uniform electric field
A parallel plate capacitor is filled with mica (thickness \(1 \times 10^{-3}\) m) and fiber (thickness \(0.5 \times 10^{-3}\) m). Dielectric constants: mica = 8, fiber = 2.5. If fiber breaks at \(6.4 \times 10^6 \, \text{V/m}\), max voltage is: