# Magnetic Effects of Current and Magnetism (NEET Physics): Questions 151 - 154 of 155

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## Question number: 151

» Magnetic Effects of Current and Magnetism » Ampere's Law

Appeared in Year: 2016

MCQ▾

### Question

A long wire carrying a steady current is bent into a circular loop of one turn. The magnetic field at the centre of the loop is . It is then bent into a circular coil of turns. The magnetic field at the centre of this coil of turns will be –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 152

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 2016

MCQ▾

### Question

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by is . Now the torque required to keep the magnet in this new position is:

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 153

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

Appeared in Year: 2017

MCQ▾

### Question

A Turn rectangular coil of length and width carries a current of are subjected to a magnetic field of strength Work done for rotating the coil by against the torque is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 154

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

Appeared in Year: 2017

MCQ▾

### Question

A long solenoid of diameter has turn per meter. At the centre of the solenoid, a coil of turns and radius is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to from in . If the resistance of the coil is the total charge flowing through the coil during this time is –

### Choices

Choice (4) Response

a.

b.

c.

d.

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