When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is ___________________?
(A) a straight line parallel to the field
(B) a parabola in a plane perpendicular to the field
(C) a circle in a plane perpendicular to the field
(D) a straight line along its initial direction
The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
(A) use a very long and fine suspension
(B) use a coil of very large area
(C) use a coil with very large number of turns
(D) use a very strong magnetic field
An ammeter measures the total current flowing through a circuit when it is connected__________________?
(A) in series with the circuit
(B) in parallel with circuit
(C) in series with any of the parallel resistances in the circuit
(D) in parallel with any of the series resistances in the circuit
While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when__________________?
(A) a most sensitive galvanometer is used
(B) a steady voltage cell is used
(C) the balance point is close to the middle of the wire
(D) a high resistance box is used in one of its gap
Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
(A) 0.1 A
(B) 1:00 AM
(C) current sensitivity
(D) 1 m A
The sensitivity of a galvanometer is given by__________________?
(A) C/BAN
(B) CAN/B
(C) BAN/C
(D) ABC/N
The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?
(A) 18Ω
(B) 30Ω
(C) 24Ω
(D) 12Ω
The magnetic field strength of solenoid is__________________?
(A) B = μNI
(B) B = μN/I
(C) B = μnI
(D) Both B and C
The direction of propagation of an electromagnetic waves is________________?
(A) Perpendicular to electric field
(B) Perpendicular to both electric and magnetic field
(C) Perpendicular to magnetic field
(D) Parallel to electric and magnetic field
A changing magnetic flux produces around itself an induced_______________?
(A) Magnetic field
(B) Electric field
(C) Electromagnetic force
(D) Artificial gravitational field