Recent questions tagged #mcq

0 votes

0 answers

For the mag. field to be maximum due to a small element of current carrying conductor at a point, the angle between the element and the line joining the element to the given point must

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

When a certain length of wire is turned into one circular Loop, the magnetic induction at the centre of coil due to some current flowing is B0 . If the same wire is turned into three Loops to make a circular coil, the magnetic induction at the centre of this coil for

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A long straight wire carrying current of 30 Amp is placed in an external uniform mag. field of induction `4xx 10^(-4)` tesla. The mag. field is acting parallel to the directon of current. The magnitude of the resultant magnetic induction in tesla at a point 2 cm away from the wire is .........................

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular Loop of n turns. The magnetic field at the centre of the coil for same current will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The mag. field due to a current carrying circular Loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is `54mu T` what will be its value at the centre of the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two concentric coils each of radius equal to `2pi` cm are placed at right angles to each other. 3 Amp and 4 Amp are the currents flowing in each coil respectively. The magnetic field intensity at the centre of the coils will be ........................

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two parallel long wires A and B carry currents I1 and I2 . (I2 < I1 ) when I1 and I2 are in the same direction the mag. field at a point mid way between the wires is 10 µT. If I2 is reversed, the field becomes `30 muT` . The ratio `I_1/ I_2` is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two parallel long straight conductors are placed at right angle to the meter scale at the 2 cm and 6 cm marks as shown in the figure. If they carry currents I and 3I respectively in the upward direction, then will produce zero magnetic field

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A long solenoid has 800 turns per meter length of solenoid. A current of 1.6 Amp flowsthrough it. The magnetic induction at the end of the solenoid on its axis is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A solenoid of 1.5 meter length and 4 cm diameter possesses 10 turn per cm. A current of 5 Amp is flowing through it. The magnetci induction at axis inside the solenoid

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A straight wire of length 30 cm and mass 60 milligrawm lies in a direction `30^0` east of north. The earth's magnetic field at this site is horizontal and has a magnitude of 0.8 G. What current must be passed through the wire so that it may float in air ?

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A long horizontal wire 'A' carries a current of 50 Amp. It is rigidly fixed. Another small wire 'B' is placed just above and parallel to 'A'. The weight of wire-B per unit length is `75X10^(-3)` Newton/meter and carries a current of 25 Amp. Find the position of wire B from A so that wire B remains suspended due to magnetic repulsion. Also indicate the direction of current in B w.r.t. to

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A circular loop of radius R = 20 cm is placed in a uniform magnetic field B = 2 Tesla in xy - Plane as shown in figure. The loop carries a current I = 1 Amp in the direction shown in fig. Find the magnitude of torque acting on the

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

The rectangular coil having 100 turns is turned in a uniform mag. field of `0.05/sqrt2hatj` as shown in the fig. The torque acting on the Loop is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

Two particles X and Y having equal charges, after being accelerated through the same potential difference, enter a region of uniform mag. field and desoribe circular path of radius R1 and R2 respectively. The ratio of mass of X to that of Y is

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

An electron having mass `9xx 10^(-31)` kg, charge `1.6xx 10^(-19) C` and moving with a velocity of 106 m/s enters a region where mag. field exists. If it describes a circle of radius 0.10 m, the intensity of magnetic field must be ................

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

0 votes

0 answers

A proton and an particle are projected with the same kinetic energy at right angles to the uniform mag. field. Which one of the following statements will be

asked Mar 20, 2022 in 12th Physics by varun (6.7k points)

Recent questions tagged #mcq

Categories