Question:
The coercivity of a small magnet where the ferromagnet gets demagnetised is 3 x 103 Am–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetised when inside the solenoid, is
The coercivity of a small magnet where the ferromagnet gets demagnetised is 3 x 103 Am–1. The current required to be passed in a solenoid of length 10 cm and number of turns 100, so that the magnet gets demagnetised when inside the solenoid, is
Updated On: Feb 15, 2025
- (A) 3A
- (B) 6A
- (C) 30 mA
- (D) 60 mA
Hide Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Explanation:
Was this answer helpful?
0
0
Top Questions on Uniform Circular Motion
- A small object is tied to a string and whirled in a vertical circle of radius L. What should be the minimum speed at the topmost point of the circle so that the string just remains taut?
- MHT CET - 2025
- Physics
- Uniform Circular Motion
- A car of mass 800 kg is moving in a circular path with a radius of 50 m at a speed of 20 m/s. Calculate the centripetal force acting on the car.
- MHT CET - 2025
- Physics
- Uniform Circular Motion
- A particle moves with a constant speed of 4 m/s in a circular path of radius 2 m. What is its centripetal acceleration?
- BITSAT - 2025
- Physics
- Uniform Circular Motion
- A body starts from rest with uniform acceleration and its velocity at a time of \( n \) seconds is \( v \). The total displacement of the body in the \( n \)-th and \( (n - 1) \)-th seconds of its motion is
- AP EAPCET - 2025
- Physics
- Uniform Circular Motion
- A car accelerates uniformly from rest to a speed of 20 m/s in 8 seconds. What is the distance covered by the car during this time?
- AP EAPCET - 2025
- Physics
- Uniform Circular Motion
View More Questions
Questions Asked in WBJEE exam
- Which logic gate is represented by the following combination of logic gates?
- WBJEE - 2025
- Logic gates
- If \( {}^9P_3 + 5 \cdot {}^9P_4 = {}^{10}P_r \), then the value of \( 'r' \) is:
- WBJEE - 2025
- permutations and combinations
- If \( 0 \leq a, b \leq 3 \) and the equation \( x^2 + 4 + 3\cos(ax + b) = 2x \) has real solutions, then the value of \( (a + b) \) is:
- WBJEE - 2025
- Trigonometric Equations
- Let \( f(\theta) = \begin{vmatrix} 1 & \cos \theta & -1 \\ -\sin \theta & 1 & -\cos \theta \\ -1 & \sin \theta & 1 \end{vmatrix} \). Suppose \( A \) and \( B \) are respectively the maximum and minimum values of \( f(\theta) \). Then \( (A, B) \) is equal to:
- If \( a, b, c \) are in A.P. and if the equations \( (b - c)x^2 + (c - a)x + (a - b) = 0 \) and \( 2(c + a)x^2 + (b + c)x = 0 \) have a common root, then
- WBJEE - 2025
- Quadratic Equations
View More Questions