4 An a particle and a proton are accelerated from rest

tration 2 An electron gun G emits electrons of energy 2 keV travelling in the positive x direction The electrons are required to hit the spot S where GS 0 1 m and the line GS makes an angle of 60 with the x axis as shown A uniform magnetic field B parallel to GS exists in the region outside the electron gun Find the minimum value of B needed to make the electrons hit S 60 60 S v cos 60 V v sin 60

Four metallic plates each with a surface area of one side A are placed at a distance d form each other The alternating plates are connected to points A and B as shown in the figure Then the capacitance of the system is A 80 A B 280A d C B 38 A d D 480A d

A compass needle whose magnetic moment is 60 Am is pointing geographical north at a certain place whereas the horizontal component of the Earth s magnetic field is 40 Wb m and experiences a torque of 1 2 x 10 3 Nm What is the declination of the place

When the N pole of a bar magnet points towards the south and S pole towards the north the null points are on the 1 magnetic axis 2 magnetic centre 3 perpendicular division of magnetic axis 4 N and S pole

4 An electric field of magnitude 1000 N C is produced between two parallel plates having a separation of 20 cm as shown in figure 29 E4 a What is the potential difference between the plates b With what minimum speed should an electron be projected from the lower plate in the direction of the field so that it may reach the upper plate c Suppose the electron is projected from the lower plate with the speed calculated in part b The direction of projection makes an angle of 60 with the field Find the maximum height reached by the electron E T 2 cm

B A A circus performer of weight W is walking along a high wire as shown Assume that wire is very tight Tension in the wire A is approximately W C is much more than W B is much less than W D depends on whether he stands on one foot or two feet constant acceleration

In the given where a 1 NC hypothetical closed surface is taken as shown in figure y 0 0 0 b Ey Eof Ex d x i X The total charge enclosed within the close surface is

5 A bar magnet is 10 cm long is kept with its north N pole pointing north A neutral point is formed at a distance of 15 cm from each pole Given the horizontal component of earth s field is 0 4 Gauss the pole strength of the magnet is a 9 A m c 27 A m b 6 75 A m d 1 35 A m 152

A conductor of length 10cm carrying current 1200A Find the magnetic field at a distance 2cm along the axis from its centre

An electron is projected with a velocity 2 x 105 m s at an angle 30 with a uniform magnetic field of 0 4 T Find radius of curvature of path of the electron A proton of mass x 10 27 1