Title NEET Chapter -1,2,3,4,5 -Key.pdf ✅

RS ACADEMY Satellite STD : 11 and 12 (GSEB/CBSE) Total Marks:180marks Total Time: 1:00hr NEET-FULL COURSE Ronak Shah - 9428239499 Page 1 of 5 1. A charged particle is projected in a magnetic field 2 ˆ ˆ (3 4 ) 10 i j T− +  . The acceleration of the particle is found to be a = xi j ˆ ˆ + 4 m/s2 .Find the value of x. a)8/3 b)-8/3 c)4/3 d)-4/3 2. Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii R1and R2 , respectively. The ratio of the mass of X to that of Y is a) 1/2 1 2 R R       b) 1 2 R R c) 2 1 2 R R       d) 2 1 R R 3. A square of side 2.0 m is placed in a uniform magnetic field B = 2.0T in a direction perpendicular to the plane of the square inwards. Equal current i = 3.0 A is flowing in the directions shown in figure. Find the magnitude of magnetic force on the loop. a) 36 2N force along EC b) 36 2N force along AD c) 36N force along EC d) 36N force along AD 4. Find the magnitude of magnetic moment of the current carrying loop ABCDEFA. Each side of the loop is 10 cm long and current in the loop is i = 2.0 A. a)0.058A/m2 b)0.028A/m2 c)0.068A/m2 d)0.038A/m2 5. A circular loop of radius R = 20 cm is placed in a uniform magnetic field B = 2T in xy-plane as shown in figure. The loop carries a current i = 1.0 A in the direction shown in figure. Find the torque acting on the loop. a) 0.18( ) ˆ ˆ i j − b) 0.18( ) ˆ ˆ i j + c) 0.36( ) ˆ ˆ i j − d) 0.36( ) ˆ ˆ i j + 6. A conductor consists of a circular loop of radius R = 10 cm and two straight, long sections as shown in figure. The wire lies in the plane of the paper and carries a current of i = 7.00 A. Determine the magnitude and direction of the magnetic field at the centre of the loop. a)58.0 μT into the page b)68.0 μT into the page c)58.0 μT out the page d)68.0 μT out the page 7. Consider three long straight parallel wires as shown in figure. Find the force experienced by a 25 cm length of wire C. a) ) 4 5 10 T −  toward’s right b) 4 5 10 T −  toward’s left c) 4 3 10 T −  toward’s right d) 4 3 10 T −  toward’s left
Physics RS Academy Ronak Shah - 9428239499 Page 2 of 5 8. A proton moving with a constant velocity passes through a region of space without any change in its velocity. If E and B represent the electric and magnetic fields, respectively. Then, this region of space may have (i) E= 0, B = 0 (ii) E B =  0, 0 (iii) E B   0, 0 (iv) E B  = 0, 0 a) option (i),(ii),(iii) are correct b) option (ii),(iii) are correct c) option (i),(ii),(iv) are correct d) option (ii),(iii),(iv) are correct 9. Assertion : Path of a charged particle in uniform magnetic field cannot be a parabola. Reason : For parabolic path acceleration should be constant. (a) If both Assertion and Reason are true and the Reason is correct explanation of the Assertion. (b) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. (c) If Assertion is true, but the Reason is false. (d) If Assertion is false but the Reason is true. 10. A straight wire of diameter 0.5 mm carrying a current 2 A is replaced by another wire of diameter 1 mm carrying the same current. The strength of magnetic field at a distance 2 m away from the centre is (a) half of the previous value (b) twice of the previous value (c) unchanged (d) quarter of its previous value 11. A stream of protons and alpha particles of equal momenta enter a uniform magnetic field perpendicularly. The radii of their orbits are in the ratio (a) 1 : 1 (b) 1 : 2 (c) 2 : 1 (d) 4 : 1 12. The magnetic field due to a current carrying circular loop of radius 3m at a point on the axis at a distance of 4 m from the centre is 54 μT. What will be its value at the centre of the loop? (a) 250 μT (b) 150 μT (c) 125 μT (d) 75 μT 13. An electron having kinetic energy K is moving in a circular orbit of radius R perpendicular to a uniform magnetic induction. If kinetic energy is doubled and magnetic induction tripled, the radius will become a) 3 2 R b) 2 3 R c) 2 5 R d) 2 3 R 14. Four long straight wires are located at the corners of a square ABCD. All the wires carry equal currents. Current in the wires A and B are inwards and in C and D are outwards. The magnetic field at the centre O is along (a) AD (b) CB (c) AB (d) CD 15. The figure shows a wire frame in xy-plane carrying a current I. The magnetic field at the point O is a) 0 1 1 ˆ 8 I k a b    −     b) 0 1 1 ˆ 8 I k b a    −     c) 0 1 1 ˆ 4 I k a b    −     d) 0 1 1 ˆ 4 I k b a    −     16. A wire of 62.0 cm length and 13.0 g mass is suspended by a pair of flexible leads in a uniform magnetic field of magnitude 0.440 T in figure. What are the magnitude and direction of the current required to remove the tension in the supporting leads? Take g = 10 m/s2 . a) 0.47A from left to right b) 0.47A from right to left c) 0.57A from left to right d) 0.57A from right to left 17. Equal currents are flowing in two infinitely long wires lying along x and y-axes in the directions shown in figure. Match the following two columns.