Force and torque on current loop

Force and torque on current loop | Learn Physics

10 Question-answer on force and torque on current loop

1. A straight wire of length 1.0 m and carrying current of 1.2 A is placed in a uniform magnetic field of induction 2T. the magnetic field is perpendicular to the length of wire. The force on the wire is:

(a) 2N

(b) 1.2 N

(d) 2.4 N

Ans: ( d)

2. A wire of length l in formed into a circular loop of one turn only and is suspended in a magnetic field B. when a current I is passed through the loop, the torque experienced by it is:

(a) (1/4π)BIl

(b) (1/4π)BIl²

(d) (1/4π)BI² l

Ans: ( b)

3. A circular loop of area 0.02 m² carrying a current of 10A, is held with its plane perpendicular to a magnetic field induction 0.2 T. the torque acting on the loop is:

(a) 0.01 Nm

(b) 0.001 Nm

(d) 0.8 Nm.

Ans: (c)

4. To parallel wires carrying currents in the same direction attract each other because of

(a) Mutual inductance between them

(b) Potential difference between them

(d) Magnetic forces between them

Ans: ( d)

5. Two free parallel wires carrying currents in the opposite directions:

(a) Attract each other

(b) Repel each other

(d) Nothing can be said.

Ans: ( b)

6. If the distance between two current carrying wires is doubled the force between them becomes:

(a) 4 times

(b) 2 times

(d) ¼ times

Ans: (c)

7. The current in wire is directed towards east and the wire is placed in magnetic field directed towards north. The force on the wire is:

(a) Vertically upwards

(b) Vertically downwards

(d) Due east.

Ans: (a)

8. If a coil carrying an electric current is placed in a uniform magnetic field, then

(a) E.m.f. is produced

(b) Torque is produced

(d) Torque is not produced.

Ans: ( c)

9. A current carrying conductor, placed in a uniform magnetic field, experiences:

(a) A mechanical push on it

(b) An electrostatic imbalance

(d) A weak force.

Ans: ( a)

10. If two streams of protons move parallel to each other in the same direction, then these

(a) Do not exert any force on one another

(b) Repel each other

(d) Get rotated to be perpendicular to each other.

Ans: ( b)

Comments

Biography of Manohar Joshi

Biography of Manohar Joshi: Manohar Gajanan Joshi is an Indian politician who has played a significant role in Maharashtra state politics. Born on December 2, 1937, in a middle-class family in a village called Ganeshpeth in Ratnagiri district, Maharashtra, Joshi's journey into politics was marked by his association with the Shiv Sena, a right-wing regional political party in India. Joshi's political career began in the late 1960s when he joined the Shiv Sena, which was then led by its founder, Bal Thackeray. He quickly rose through the ranks of the party due to his organizational skills, dedication, and ideological alignment with the party's principles, which advocated for the interests of the Marathi-speaking population of Maharashtra. In 1972, Manohar Joshi won his first election to the Brihanmumbai Municipal Corporation (BMC), marking the beginning of his electoral career. He served as a corporator in the BMC and later became the Mayor of Mumbai in 1976. Joshi's tenu...

Professor Cheiro Prophecies about India | 5 predictions Professor Kiro - Kiro made these amazing predictions for India

Professor Cheiro Prophecies: Here is Kiro made these amazing predictions for India: Professor Kiro was born in November 1866 in England. At the age of 17, Kiro came to Mumbai and met astrologer Vednarayan Joshi. With his advice, he will reach the Himalayas, Kashmir, Ladakh and Varanasi. From here, he studied astrology extensively. Kiro made many predictions in his life, which we are giving you here. Cheiro, whose real name was William John Warner, was a prominent Irish astrologer and palmist who gained fame in the late 19th and early 20th centuries. He was known for his accurate predictions and was consulted by various prominent figures of his time, including Mark Twain, Oscar Wilde, and Thomas Edison. Cheiro also made some predictions related to India. Parada Kahanee One of his notable predictions about India was made in his book "Cheiro's World Predictions," published in 1926. In this book, he wrote about the possibility of India gaining independence from British...

Biography of Abbie Hoffman | Early Life and Political Activism - Later Years and Personal Life - Legacy of Abbie Hoffman

Biography of Abbie Hoffman: Abbie Hoffman (November 30, 1936 – April 12, 1989) was an American political and social activist known for his involvement in the counterculture and anti-war movements of the 1960s and 1970s. He was a key figure in the Youth International Party (Yippies) and was known for his theatrical and often humorous protests. Here is a brief biography of Abbie Hoffman: Early Life of Abbie Hoffman: 1. Birth: Abbie Hoffman was born on November 30, 1936, in Worcester, Massachusetts, USA. 2. Education: He attended Brandeis University, where he earned a degree in psychology in 1959. Parada Kahanee Political Activism: 1. Civil Rights Movement: Hoffman began his activism by participating in the civil rights movement during the early 1960s. 2. Youth International Party (Yippies): In 1967, Hoffman, along with Jerry Rubin and others, co-founded the Yippies, a countercultural and anti-authoritarian political party known for its unconventional and theatrical protes...

Biography, Science, Technology, Health, History Blogs

Search This Blog