42) When an electron enters a magnetic field of 0.01 T with a speed of?10⁷ms^?1?it describes a circle of radius 6 mm there. Then specific charge of the electron is given by

43) If an electron moving with a speed of 2.5?10⁷ms^?1?is deflected by an electric field of 1.6 k V?m^?1?perpendicular to its circular path, then e/m for the electron will be

44) If an electron accelerated through a potential difference of 500 volt attains a speed of 1.33??10⁷ms^?1?then specific charge of the electron should be

45) If an electron accelerated from rest through a potential of 200 V acquires a speed of 84?10¹⁶ms^?1, then its e/m is

46) If a potential of?10⁷?volts is applied across the electrodes of a CRT, then speed attained by the electrons is approximately